Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f187e6cefe4bd82…

MALICIOUS

PDF

83.6 KB Created: 2021-07-15 20:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cfb7f1e9bcb1c944c8f87f21bef061e3 SHA-1: d022e2bba0494f0165b15ed94e75e29bf654b991 SHA-256: 9f187e6cefe4bd8265cd578ebed9f78f7e9334b727a5158cb750926bd4e929b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 CMS upload directories. These links likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d78ae022a68a7bb0ea4e5f37a4b5447b/bewevilekedenipusikawa.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160890db3cba83---39708573367.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/47273897830.pdfIn PDF document text
    • http://promador.pl/userfiles/file/vetaxika.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1910d4ac7---81906426889.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/76485381c5e52699ec90fb8124543c69/3191673105.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/19880707986.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0ibtidj4vler80ql334cgckaq7/91449129850.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/5212d1219e8ef7e7d92367ab3afa930f/78517497179.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/54afde87efbb9497cfc311fc63b35561/raxijefow.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/20496566519.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/67799527563.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a697db95e21---16124043791.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/dutomemubuf.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/zozonovo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4eb59297---bejusonunifoxufidabove.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/49376573714.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac22a171e4---katevalesapogev.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/kifolaxa.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7e87160a94f0fb10deed79866b085702/jepox.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/76142435616.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/40180323902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=the+baby+is+breechPDF 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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 10176 bytes
SHA-256: cc8009a2e3582c2eae787a338bb6b2f0ad700be50732141022dd71b4e654b20a
font_01_sfnt_off0000fe9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AC 16524 bytes
SHA-256: 89e56bc81edefbb7589c9b10646fce198b15d13449131099875672f64ac4e4f4

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