Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa6ff31100c129c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-22 10:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb314cc9172adde910f44f4e7c258412 SHA-1: 95b4da7a520a8c47aaee0e42a94ab7a306550500 SHA-256: bfa6ff31100c129c0e8d23ac00240899bfe800d7b18c3ea86b8963601a782d42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to improve search engine rankings for malicious sites or to distribute payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=ufi+android+toolbox PDF link annotation
    • http://tele-fonika.pl/upload/file/15811250356.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0374643001631945452.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/bapifipawizes.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/kepabavikinotaraveke.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/ribudezomunikofujij.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/28895529424.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/52270620588.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/2991448843.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/38545640389.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8fa6dd14077ef1d8bc78875979f51409/69733585374.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210912072304_1407837801.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kikurubedav.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404e5b51d4---66681125721.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/32640720125.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/gulavikutut.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/52926984290.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/62361581109.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614778bbbe096---lupikawonegawuresufot.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/84706729178.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397ebfc4c18---letukafodepizaxexajekixil.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/91515854326.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/denug.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/golitun.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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 10296 bytes
SHA-256: 6ae73b2930399e0a3b3f70c2792dab0e628839911326a0595083bbc15e6bc28c
font_01_sfnt_off0000e10d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91F 18064 bytes
SHA-256: d519f6adc354246b32cca9edc1111dc5c32cb0f53e0e43366b8cb48a5fc942e5

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