Malicious PDF — malware analysis report

Static analysis result for SHA-256 81698b894281a071…

MALICIOUS

PDF

86.7 KB Created: 2021-07-09 17:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c4461a5ca74da7cfc628a1a0aceb358 SHA-1: 587aa5626352ac770cf1bdc51d0adeac68018a7b SHA-256: 81698b894281a071f563d8c651f2b4ee3e6eaa4429de7c25e7387a739886dfc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs point towards an attempt to exploit user trust by masquerading as a legitimate document, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://geasit.it/userfiles/files/74906467499.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/12c3510a2acee40f2c5159736a0adfac/56428280869.pdf
    • https://lacaune.hu/userfiles/file/19499383320.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/379e9bbad37de560a679d66a0e6d0a11/jazibusomafuxujalij.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0bffaed84---zufikinakukaduxularuf.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f5888551---55439236360.pdf
    • https://travelstore.tn/userfiles/file/petelamuruwegizapo.pdf
    • http://kingalbertltd.com/uploadedfiles/file/vunarika.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be88b5b0d7d---68312227637.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/f9893cd0b16b948b630134e0f36c5a4a/sobojogisudamo.pdf
    • http://farashimirooz.com/files/xizesose.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ee41bef3---97823142798.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd9668363---xukeburubifuxuv.pdf
    • http://cariboohose.com/userfiles/file/xuwebinelojelodet.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afec21db091---fawufutulu.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531d56fd41---rekojatowur.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e0869ff4d84533a5929f5c53ff7b4332/rarelumalikabujatalaru.pdf
    • https://commonwealthsportsawards.com/userfiles/file/fanimuvipuk.pdf
    • https://gionggiacam.com/ckfinder/userfiles/files/falavizod.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070bf1f047bd---18827992247.pdf
    • http://allseasonsart.com/uploads/fck_uploads/file/38385362194.pdf
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c07656f7d5fa91f984531c0d1104f78b/lamatedipatuwituxul.pdf
    • https://airbays.com/userfiles/file/22205171716.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b35b556be---14209735132.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160810682b03ef---1950027026.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160986d45140b2---waragusok.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+practice+of+system+and+network+administration+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 16792 bytes
font_01_sfnt_off00010773.bin
c6094ae2a950650122e6a526068bfe88ae054883a8c5ea9c2c610cc77fc2ec8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 16768 bytes
font_02_sfnt_off00013317.bin
57c8bb3482ab7c9b563159a87e20c72f9b1b0f00bdbea93c30bc2bf38a0b8f3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13317 11140 bytes

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