Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17c8e84f5551acf…

MALICIOUS

PDF

82.1 KB Created: 2021-09-03 18:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9f562a2c99ba5cc41b132c73f6247095 SHA-1: faab35c597197cd36a49788e1d592e1429c1a245 SHA-256: e17c8e84f5551acf4f9c243641c16c208768c4a76098b67e292804b33ea42615
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to potentially compromised websites, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users by directing them to external, untrusted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/b7e76d823100ab92a163f46670b93906/gupatepitijev.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c142593f83---82285168604.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/suripuxebojoso.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/xakukodajuxaj.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/bdf45d58f54073c72fd54305d833fb18/fobiwofuxeti.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/49683349928.pdfIn PDF document text
    • https://digireg.es/upload/tezulagulopen.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/ropasuxopatese.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf381895e---kupodurikebakujet.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/lixikeju.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/19efcdb54cb135937f93e69126086522/73455456581.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d18aa7ec29---valizidejane.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfed808558---11461387744.pdfIn PDF document text
    • http://runo34.ru/attachments/file/44382482596.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/41299019571.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/sodavonoxufogapunuluxa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/i1lp0d94d6b53atsu8dtnss644/87514675004.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/44f21dc41d3f6244c0788c04a91333d8/9383856681.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607176601a78d---bilotelikesevi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/29a5af60dfc358e8e1dda2a254f29fc8/fefoguruxefab.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/10567786307.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/74495156032.pdfIn PDF document text
    • http://haphadoor.com/upload/files/xavazovedov.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/27817206596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ensayo+sobre+la+ceguera+pdf+libroPDF 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_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDC 19748 bytes
SHA-256: 511edc8cba4ff30b51baebd8e2a6b7c6a43d2a3db618e3800f4506a24988a942
font_02_sfnt_off00012145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12145 11032 bytes
SHA-256: 723ee3aa5d3083a691264198a028096500fa59c8988a8ce9dfe965d678468880

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