Malicious PDF — malware analysis report

Static analysis result for SHA-256 876a07e379466f9e…

MALICIOUS

PDF

80.4 KB Created: 2021-10-11 05:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81dfc419439619c22f4dc99f4a094222 SHA-1: b16ae6fe2a825a357bebe9206a0e6a7aea38ace0 SHA-256: 876a07e379466f9ea08f5df7ccd6bd84bbddaba83263f43a9266c441a9d1b112
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 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 https://najemwroclaw.com/userfiles/file/35432900018.pdf In PDF document text
    • http://ondamarinarest.com/upload/files/nikidofatidiwusunagoluxon.pdfIn PDF document text
    • https://ratosatu.com/contents/files/69245967937.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/76079539745.pdfIn PDF document text
    • https://nls.vn/upload/files/pugenavalabagu.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/fd64083b98f33767d133e3976576da5b/viwikufadigijemufu.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3704881381b52b714557f74dad8deee/83922553422.pdfIn PDF document text
    • http://lovesenergy.com/file/givegewerosipox.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/3443009484.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/fulubewajodirenisiwose.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/laluguwukelesedogemav.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161435f419a307---20530774619.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/72549776360.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/47290659512.pdfIn PDF document text
    • http://huynhgiabaohotel.com/uploads/FCK/file/40606651009.pdfIn PDF document text
    • http://ontozescentrum.hu/tmp/viruletigewi.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/11197612275.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wipin.pdfIn PDF document text
    • http://www.vnv.nu/admin/library/ckfinder/userfiles/files/digek.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62069467944.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/numumowuxog.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/87150292310.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/kupok.pdfIn PDF document text
    • http://ativn.com/upload/file/gaworakonuta.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ade69c38e---92479957469.pdfIn PDF document text
    • http://lgassociates.in/uploads/buwaloz.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/10527307813.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/47881784167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=seeing+balls+of+light+in+visionPDF 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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 16344 bytes
SHA-256: 1595023e56220aa5a2e5ca82c90ce72c2b5396cfec9f724fab739f142b8acc43
font_01_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACE 10676 bytes
SHA-256: 2f2429468e0acdedb5e97b71eadc6c4eb5591c236c50159ebe49c16a70cb2303

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