Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb87a43c8a0c826…

MALICIOUS

PDF

179.4 KB Created: 2021-06-29 15:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6569057da0b3982a0f9d09ae65dd511 SHA-1: 06a9817b68a9e39c8bbfd90c8849fe8bb22644cd SHA-256: efb87a43c8a0c826caeea023e8d18ce68007ac77937655c4acb2a4d4a440954d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a link farm strategy for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

Heuristics 6

  • 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 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://happy-travel089.com/CKEdit/upload/files/zunufexufolowikifumabamab.pdf In PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec1697bb2---21446553817.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810486ba7e2---xakedu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/vdmv5ic20olk1e7agn2ba34htv/likamexamatujibasuvazipi.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/kimelarefamaxuka.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/69555913947.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098db031e346---94562332165.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/3714986795.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aa88185ce---pisaxizijeposegilumisases.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/77872247612.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a630c7e54c6---19801087338.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/37994154178.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f4874511c---doliwopewivepus.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/48b6161a1319dc2c84331fd9a68e460b/xevakirisa.pdfIn PDF document text
    • https://mvservice.it/file/muxulivutedezudo.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/f61s6btn0atrak24i3dujeairs/gekaxegegavawelibo.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/lonosozaxisa.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/49512512082.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a26a9ac451---97137221253.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/40858162705.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aaba9620605514e18e93646482761347/10775731326.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d28f6dd7f6d---tageboxogiwiteguvoxawetor.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fadd05104a---914143290.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/2f6808c446473b5b5eda883e0ba1e934/rerakafitizosatidaweg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=30+day+shred+schedule+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2434A 10716 bytes
SHA-256: 27ada1216745cdfcb038677f020c282987f0958e17ed483bd228ecbec46fec5a
font_01_sfnt_off00025c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25C0B 16880 bytes
SHA-256: c01bc694274281de82f3e02e160de2da6affc029f165bb48d05d5121110b159e
font_02_sfnt_off0002745a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2745A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00028c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C6C 18644 bytes
SHA-256: 9890601068cbe99e7f5811b212506f6ea96c26447cdb46d61c5db5ad8b538355

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