Malicious PDF — malware analysis report

Static analysis result for SHA-256 479007ab8e54d078…

MALICIOUS

PDF

87.2 KB Created: 2021-09-04 07:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3ab8ed49c02df4b664c40cdc73bf0bd5 SHA-1: 8241cc5757aa7336d892dbd5accce02e1bf4db4a SHA-256: 479007ab8e54d078ca96e27457410d9ac970cedcb9f82622c8bbc34656afc4a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely for phishing or SEO poisoning. The presence of embedded URLs and the structure of the PDF suggest an attempt to exploit search engine rankings or trick users into visiting malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f278ceba48---wasanujutadasisen.pdf In PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dolis.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2d95aac603ecba265f592b15ff415b9b/11524773785.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e2ae52941---palibabijijobono.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/nijibav.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/4903737178.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210515190634_1739797416.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2df008ce5---67305405261.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3b1e34119---69847231211.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e38acb788---73433163234.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/goforiwarijuf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/gezuzowadenarabazutedili.pdfIn PDF document text
    • http://zuche0551.com/upload/file/12983694485.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/4215517362.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607146b0b7e78---68308111931.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/33399229764.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/69416262596.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/foxiwileziniderowaruw.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/14101440087.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/23685422547.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/a310332d2b4995e810b23789a147ef88/51387205038.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa62e130149---webagesogiz.pdfIn PDF document text
    • http://herve-coiffure.ci/files/56266423794.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/vowumedazuwetiferik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sistema+de+gestion+de+calidad+iso+17025+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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 17728 bytes
SHA-256: 1a3704b061b42735b091738de35c7f972d55d9e17d099f8b7a509cdacbb99cf3
font_01_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 11416 bytes
SHA-256: 9eac42a130dd4b08d0aac4a4ef494d6871d4fbce5ec2e30cc65a466a76ba679f
font_02_sfnt_off00010b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 17012 bytes
SHA-256: ca1cecfbcc184586850c4e82fb97491ffd82b90579ae47316ea274f28404d90c

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