Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d51cc97ecb7e58…

MALICIOUS

PDF

90.0 KB Created: 2021-07-16 00:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d9a75e17c62fd182cba694c30464c4b SHA-1: 3eed41193a6a18e32af3566085cde21d3c9d0619 SHA-256: a6d51cc97ecb7e58df5e8a54d98657db006c567667a604f6e4c2d26d8a85d0b5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdaa754713---gosak.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://creptiles.dk/userfiles/file/kepirakilezaf.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841dc33f8a4---poloxilafupitoluberiwez.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/97cfab22210fda5627a664f6b15fd47a/59045562352.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61143bf485---bobebodujeboxuwix.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/20890128353.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/remubikezigutaxere.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/koxezunoxa.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/toponidowaxujuresevu.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/gurep.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f4d10d4f5e8e3746d764f519bb29d337/28775089770.pdfIn PDF document text
    • https://invest.pl/userfiles/file/90512801743.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdaa754713---gosak.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d8b85eab9---55430211401.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608838c20263c---83577701570.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d0a86fb0c---senatoximewadekividibabe.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/96605929873.pdfIn PDF document text
    • https://abeess.com/userfiles/file/wofipagupinuvir.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/44882814111.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pezigiwivebum.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/sutaxelitezororer.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kowemunavu.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/gusonurupun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=post+nominal+letters+for+master%27s+degreePDF 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_off0000fd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001155e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155E 10732 bytes
SHA-256: 7fc5629e0c5fab296aa34412f3e8ab903d19e48591d7c04662adc5c57804a815
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 17152 bytes
SHA-256: dd260cd1bee3182e4101b84643d6b23559badc60d10abb86425a3a9cd2fb8920

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