Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2908a63f0f7a725…

MALICIOUS

PDF

100.7 KB Created: 2021-08-21 13:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eeffbcad64d3fa6f40ef95f2f5f21c1e SHA-1: fd0fc8a99b9e6575df585e10d1298263af5eeece SHA-256: a2908a63f0f7a725bfffc12a59195dd4975ae96a05f927a1180997910fc2d5d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on potentially compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of numerous external URIs and link farms suggests an attempt to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://share-world.tw/userfiles/file/tilolokopufebudugakeniwas.pdf In PDF document text
    • https://mwasafat.com/uploads/files/zetituwuzugorijuzujuvamaz.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/mubimefoxosizosanixi.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16102f773d4d99---rereronewanobogi.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b153805c0a6---judex.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/sofegifuwibipefomix.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/2651791809.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/29158525659.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c2c9120dc---ratazox.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/70a058aae83b2ede2a4f3578463df7a0/41379625861.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/fumilobewiz.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/valupemuwaxujazelezorupox.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/61986791668.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/vakefurukogu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5bb8ed496---getabaderenomimizigetufi.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607583a515e9b---96648494823.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/mudaxa.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b73d4a23868---bemuxibonibufijatokej.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c9b73cd18---90455346756.pdfIn PDF document text
    • http://fruitofthespiritcatering.com/clients/9/9e/9e5e3efd27976f294ade36eaf76108d7/File/pejugoxeba.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/bunesuderiku.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/43694778092.pdfIn PDF document text
    • http://geraldkleinlaw.com/ckfinder/userfiles/files/13908036286.pdfIn PDF document text
    • http://rjt1.org/upload/files/nipomofefekaxidazuzo.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210812173232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=idalberto+chiavenato+gest%C3%A3o+de+pessoas+pdf+downloadPDF 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_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E3 11408 bytes
SHA-256: ed0cbadcb4d965e6bb6c9db479b09c476af321acb4419b877cd2a9060cc21424
font_02_sfnt_off00014cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF0 21988 bytes
SHA-256: a2708d461a54dec0514ea212afe019b8b488138e72d6c26ff2277b69b4f8ae87

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