Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5e3510fd7fce0d…

MALICIOUS

PDF

92.3 KB Created: 2021-08-09 22:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16c06d43648528dc7a373606c1bb783f SHA-1: 9af2a7d29e5f0136199547111f132c88bb1f21d9 SHA-256: 3b5e3510fd7fce0dd40c2b52ed7928c4ca20f7eafec38455e4cdd67eee47a8db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=lock+screen+stitch+wallpaper+dont+touch+my+phone PDF link annotation
    • http://tilestone-pools.com/i/File/13153455767.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/16056218523.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00d584b3ef---5392748363.pdfIn PDF document text
    • http://apple888.vn/luutru/files/67517010517.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/4474a49bacbb9d7148a76379d980a9f7/32589251196.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5444a1a5e---72856006694.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210616231741_cuxxkl.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/66808690452.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f044fe84d2f77781b935a341236a74e2/bolekajofamunalefugiz.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/rebuzirewakuge.pdfIn PDF document text
    • http://namdolove.com/FileData/ckfinder/files/20210703_1CD6224AA2E689F6.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/gagunozoxi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/92ab678e1481b49043bb1f9d3fd21d3b/55453303037.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/vovawanenujaxejuxa.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef4d1404c2---vinizifatogidufuzuxid.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/zixokepaxa.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/tanuvas.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/16e4ea61ebed7902a00cdeb1377fbade/sufawurixoxabetuguja.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/hdikitsguu9rr4tcdt2hcsp6s4/wisajitapimaxutoxuwu.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/506efa3d1720a8bc187a0a241544406a/tubidazowime.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/523346cc4ba025609ec735c5939e962e/loxerixewunigol.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/rakogoxuxup.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 16208 bytes
SHA-256: 2f3fe951f676449c007eb4943798298cab6c0f5d949777e196d05408b3292a1c
font_01_sfnt_off000102e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E7 11128 bytes
SHA-256: 05afe94c43d39ea0be8955895071afd2b851057d06c6515144cbc964dc7d9087
font_02_sfnt_off00011cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D8 17024 bytes
SHA-256: b185b8d8db97e5a50ec8004470456b9052dbf0c6b931e683aa5ae2b6540be4e4

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