Malicious PDF — malware analysis report

Static analysis result for SHA-256 2705e5476052ba1c…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 01:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c58552f44bf7d61c2be06f52508a5e3b SHA-1: d89c9c0508d77ef33ac514fa139eee33e245c907 SHA-256: 2705e5476052ba1c13f6b219d8ee51ea65cda74fb19dd2289e09ab03f0c41add
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to disposable or compromised hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan PDF. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of numerous external links strongly suggests a malicious intent to redirect the user to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://rzfmuhasebe.com/userfiles/file/nalomonolenozizojabojes.pdf In PDF document text
    • http://pspectr.ru/userfiles/file/pokepotunazuboxeji.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/02c5652becbe69861e8064292b116ef7/42105628953.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607195f62bb89---fupatiwebinafibe.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/besigadod.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wavijozir.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/fodobelival.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba28bbc643---86694315463.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f05f88e81---lufodutaresefejifudedefi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5c74400f---51734035131.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/3fv1glc21coltgm8da7lbil844/37450598017.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfa18e888c---3674722930.pdfIn PDF document text
    • https://bgmediation-flm.com/userfiles/file/88696343013.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/97393180786.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7c8bbeacf8d1b237531cf9d2bba90c98/44548178518.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/jizidoralogadoxemades.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/83357044406.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/98454675400.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/99305284627.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968e6ca385c---denuja.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094abd226fca---waginesonika.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e4rbcp4olork9rj6fkglbbbra3/mekifufapobuvekepa.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/831920fd982f04b974bab50b5ac29e72/lefademosavi.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/77053935989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=why+did+the+elephant+cross+the+roadPDF 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_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16976 bytes
SHA-256: c28388b1c1e32449f4b45a9c3fd7df88b148ef4f34f3d36ed4b6f5927ab50fbb
font_01_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F9 10716 bytes
SHA-256: b57033e7805b3b950dd4f9b43a76bf328791c5beb5eeb7f585b0e4ea2485061a

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