Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad638060424a5a1…

MALICIOUS

PDF

104.2 KB Created: 2021-06-26 14:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5323d547c24c7c6f0e153a90c527da75 SHA-1: cb14e423fdeb3837bc2ed9654aa2b3e18943c015 SHA-256: cad638060424a5a1b550c3f6277e45eb363d98920a1e4e8ef8a9f3b9ca35962d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9244

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://oniceh.ru/uplcv?utm_term=meaning+of+consistence PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/002aioa7boq0grlr8h7o7vjoc2/dorawudomusalarorinekuk.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9a1ea91d77bf89fbad818ca617e92be1/finikotobujot.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084f753401da---55702106095.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800502cf9c---gilira.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/kikunewavulewam.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084ff2e2082c---debudexelabikasin.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/56846345724.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/voxijuwarukilofej.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a24385e249a---nilisavesoropedepi.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/8337841947.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1b746ffd---85353274070.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/nifamujaregux.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/tasumumajurit.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c674235fcf1---sidutufujixefunizove.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/c22ab759f3a482899660e5b7a754f863/tenibonet.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/cu2mfj6v5h258mo82flj86qj89/kuvosojaluluwim.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/67461394546.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/zurobaviromo.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/n422kcheape2a1apic0nvr5216/3673283068.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799a636abb8---8219866947.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b111262e131cbe3ba3f2db8936b72d9/78847825755.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/69348519164.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/remoluvikisos.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7jrjmi4r16m59ci6h1q1aqbovv/7645818298.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7f6d8d407048bdbcaec10a9eae7e6422/6165144232.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/63e2236a1eadcd5d93c352b3527e8e8b/31091917683.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/46205463441.pdfIn PDF document text
    • http://janyska.home.pl/_mjanyska2013/fotki/file/70039055351.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00016017.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16017 27480 bytes
SHA-256: 8c8c9742e1c7453785284e11e357cca38dab11deff2b8a922220188778fbd318
font_00_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 10356 bytes
SHA-256: 5117bd012d16408862f282f83488df7e422a8e0198103b441dd69a9dda995233
font_01_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 21372 bytes
SHA-256: 690f36ac18a2a9e0c613f73dcf7e6f23597b05e0634d6640439299e8fc10c31b
font_02_sfnt_off00013def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEF 2300 bytes
SHA-256: 85f560edcba15ba983922781ec9eeec8cfea509f76d1dea52d67f8cd246e99c4
font_03_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1