Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4b13f9b9e86924…

MALICIOUS

PDF

88.8 KB Created: 2021-08-17 21:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5bb59468e1de7915c36609ae0f4c650d SHA-1: 4f545636a23753833a7dfb917f61589caf588dee SHA-256: 4a4b13f9b9e869244448e4c9df1ec41dfac763d07b93efdaad42ed852950510e
156 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://netpost.vn/upload/userfiles/files/20384602787.pdf In PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f9906b15db5edfdc0fc884e333d3a10a/45568544011.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0hlhoac24l0ufh4c27c2p0eeld/kitadofubofudizewizodim.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f3ada4fc4706a1485ffa5db4a9ff38e8/99558120083.pdfIn PDF document text
    • http://rajhansnursery.com/userfiles/file/zaxasutuxubijan.pdfIn PDF document text
    • https://bselink.com/userfiles/file/pexubuwivaded.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/84705008004.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e94b95f413728a3c78ce71d10dc20f3b/66510900429.pdfIn PDF document text
    • http://garderoba.sk/images/_file/41420928175.pdfIn PDF document text
    • http://kag.fr/userfiles/file/37439201570.pdfIn PDF document text
    • http://benly-carson.com/product/files/65707071260.pdfIn PDF document text
    • https://irantruck.ir/data/file/70161381476.pdfIn PDF document text
    • http://point-grey-1970-grads.com/clients/f/fe/fe7686cf254963525dc0bd811951f15e/File/59039464273.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16097f25f4ed24---bixukesadezowi.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/mamamupetanofeguzonaba.pdfIn PDF document text
    • http://popeyebio.com/upload/files/getikudisufi.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dajagusozasa.pdfIn PDF document text
    • http://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/90369137568.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/gawutaxagox.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/28077117480.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/km1u1akiqplajfsmb93gfacccb/ramezejagujimov.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/24331331444.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/19136687241.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608efdf3499ad---dofanupisapudugivaxozina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+clean+my+hoover+dual+power+carpet+washerPDF link annotation
    • 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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11136 bytes
SHA-256: 95e4ca2caec15ebff869b720238a92ab81fc959dcd3b5c8aa05ad60cec731728
font_01_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 18296 bytes
SHA-256: 016e5e2a15dc443c2aca6394fbfe5a3f630d2b0f443414c55e44627088129548
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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