Malicious PDF — malware analysis report

Static analysis result for SHA-256 108f6807269f10a1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-07 04:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 34731c98baef9b8f7f0ade5e36460ef1 SHA-1: fb3fb3ab2f87764dfc06417b882509e17315b3f1 SHA-256: 108f6807269f10a161be3f3dd5e7696e679fc531d87bd01edb0b35565824ca15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://wastran.ru/uplcv?utm_term=peter+kropotkin+conquest+of+bread+pdf PDF link annotation
    • https://digireg.ch/upload/wisap.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/c3d9bb8ab89717f93193590c63331b4f/40100926442.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/jijejozinafow.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f325839753---53222342894.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086d54f3689e---jepupirokajuv.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dd23d53dfb39eb6bc1b63499f394490f/75472091476.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/jobisoxa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/734441795cb5c2c746945861a7bd397d/bupikutulibasiw.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/18932030b050690fafd88f00e707c544/baxonopedaredojuvimudovi.pdfIn PDF document text
    • http://findusafranchise.com/files/files/jumuromeduragaga.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/luzikikox.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860013d6202---94312707462.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/av3h5co5tr41jvepffbkpiu3jq/63403832407.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/22540156014.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bea121bfe3912b0b71096984fdea7d0a/jorigorugosijubozetab.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/81213776652.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/dutijepiwusuranikir.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/3082604386.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/rexidamazo.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/9992m23tiqbevlkerhtf8778ru/80391359931.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e92b5bdd1---nolirumajexezase.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/xidezuvepuvowedakereraji.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/wevep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 11044 bytes
SHA-256: 0aee221b4ea7dab53809c071f353836fa34ce0c3c610ed0fee1d75ae58c1894d
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 19492 bytes
SHA-256: 9d33800edb70613c3a2382956bb80515c75a85205157b0dd6924fe91ab05469c
font_02_sfnt_off000125cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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