Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b16318f3d1bf959…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 09:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90f82d34a83d59af05b297ebcaadbd8d SHA-1: 5c57313498dda06faa3bad990087fc6ac4d73215 SHA-256: 4b16318f3d1bf9590f32efa062a1b94d02755b6fd1f3a01e24ed5b98208aa156
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to exploit user trust via compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://unseretochter.com/images/file/90190051682.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607847cc87050---fipebuvowezo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bff95484082---buzugakadilavonopewu.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c66fcfbd98e---kekixivigu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160881abc91ae3---48885791222.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a4e4e0bdf2e3cb917afe0ed30f5cfc15/dofanufofip.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/70507706987.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/43cbb313813e725d9c5f1427691653df/52886368757.pdfIn PDF document text
    • http://fkhd.cz/data/img/49386034553.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/bcfadfcc0835ef4068f25e5090a16f59/19620672573.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7be23ccabf---rizedavaneridarugozuvob.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/13446334613.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/63306596779.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/relija.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c9b1a039e396ac4afc589d850a3d95a1/48654638942.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5cebd351---63290572879.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/goxiro.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/zeduvefaripav.pdfIn PDF document text
    • http://pinxedien.net/upload/files/34945180215.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/62625457171.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/resudibameluvulezis.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/ragubomebubidikupanik.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/tavamawuvisulugeb.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/24888165231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=control+valve+characteristics+pdfPDF 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_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CC 17112 bytes
SHA-256: c90daaf30431366a6c410fdd558828522179cd456abc97dc6267576013c2c3f7
font_02_sfnt_off00011f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1D 10816 bytes
SHA-256: 4ce7fca8b1ffd13b0c91fc831018e58e00620aa8ce8c5e74094bcf032c6aeb2e

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