Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bd6ba58060ff2fb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 15:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8766d228688a4d0ec1dc457be9b86d9d SHA-1: b4964d1d39f16a258ac392e04bc5f327302f0cb1 SHA-256: 0bd6ba58060ff2fb928cecdbfa7ea45ffd5b7eb22b5db0bd4ccc1740ff9977a3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites and disposable hosting. These links likely serve to distribute further malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_RANDOM_URL_LINK heuristic specifically highlighting a suspicious URL that is likely part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nhc98p28e8ckaon91h2udtno91/68654568171.pdf In PDF document text
    • https://yapluka-services.fr/userfiles/file/ruvagukoreta.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/sorawoxaxaboxo.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/30874653169.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768309316e---zamovupuzawiwawaxewut.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc8ca71ee3---pedamifexelu.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/somananegukuside.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/3556106962.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/walodiparonuvolizeded.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/90db39e9ac588097540179142fd853e5/60382683903.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/31042702584.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/1022998741.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084307e1c0e0---zegenofumi.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/15209990404.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/bokejoditokeruvo.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110293fdd037---gekix.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/61839674693.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/wofawatuladafuli.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/minitudizove.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/11535098761.pdfIn PDF document text
    • http://centromp.it/userfiles/files/65526234883.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/mozigir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=narrative+essay+structure+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_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 10600 bytes
SHA-256: f049c2397068ff235376bfa29ba24f4b79b6ec580a2cd98e6622996196cf120b
font_02_sfnt_off00010e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E12 16916 bytes
SHA-256: 3f3c6f4d53ab54ac5a7d38990d3eff17f62bc989c918b544fc1fdc78222cf49c

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