Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae91974658203e56…

MALICIOUS

PDF

92.3 KB Created: 2021-07-05 02:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 91c1caa995a45b0231c0c06a93a9d720 SHA-1: 8085e5151284ab8b24b24af954a782354376e32b SHA-256: ae91974658203e560fe741c92006480b7d37ca9a7419f906e5ccbecfc3f62344
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites that host further PDF files. This suggests a multi-stage attack, likely initiated via spearphishing, where the initial PDF serves to redirect victims to a payload hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c30ca82878e---lirokakuwupevobu.pdf In PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6fefb4ac34afb3eb38f439442ea3411f/kigedegojurimakuwezew.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/2c59fc76bd7df48163c29207bb23af68/92080883510.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9d31aa57---35578059974.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/6768228ed0eebec7c667098f201fe778/basogiwixakuwotitekiwewa.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d6ff6214693414b316ba2403c0bc9589/16580372911.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/ninadak.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/69386829062.pdfIn PDF document text
    • http://stratford1980.com/clients/1/19/19838be1bbe5684469623718d5e25b5d/File/18299762111.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b4a8c1f0---vofewedetoremetabolu.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/texumelevezogilabebuxif.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/wejedoruvuwugeropazawi.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/vtps3m996a8kn6r26okcjavgj5/towasa.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/4sl3nphef0rv55tginepj88fs6/89115937782.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076066a5c0d8---dofiraz.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160730ad8ec50a---kemamebikikexosafumid.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/53730129909.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7e5866e05e1637de9f762ede79416067/71493772970.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/xavexadonuzawiz.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/24089265696.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/74397159377.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hotel+armitage+booking+form+listening+answersPDF 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_off000101ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10868 bytes
SHA-256: 9278c22b3c6597643623eed56ec35be50eecca7c36e5ace98528b5d662a4aa53
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 17996 bytes
SHA-256: 1a5f340e4d95022fc7c5c8a77473ff0f4c55d451a3520af082eb020261424227

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