Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fbb9d1b418219a1…

MALICIOUS

PDF

94.9 KB Created: 2021-08-13 16:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a85b7b2e91c6e829392a44cdf2a1cc81 SHA-1: f34f9020d4e4109f5667a2daae6bb4a3aafd1135 SHA-256: 2fbb9d1b418219a17a9107c4e6768d9d70157c38373eae3c8dda5f492be77ec8
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 WordPress upload sites. The embedded URLs, such as http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9ca38f16---47428214494.pdf, are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5cf639889---niwebunatujodagokedetigab.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe282c0631---kavegakixadikexu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/59185403146.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/d1e2738dcbdbcfbad7443f7db767a726/jegukexamezugurivemitoxe.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa9ca38f16---47428214494.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9dca1275c---mamowukotuxizilavoza.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qs8iq2vl7to4aaldp687s4pun1/buduzefewudivusutumemex.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/xofimiwixawe.pdfIn PDF document text
    • https://aashianarealty.com/file/bubuw.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/o1nk7ljt17a3o6bv1a8egtlod7/18312241059.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/12bed45b2c609a604023068ece314f1c/pilumedatuwuxaxovulonoje.pdfIn PDF document text
    • http://garderoba.sk/images/_file/82853038268.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/47c8a20162b45935e737ae3e1d75ef6b/fiwenodowul.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/fuwigerekesuvat.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a18b4d31c---rofonufodukovebamib.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/tilulofemaxuwereni.pdfIn PDF document text
    • http://vce34.ru/attachments/file/xagorixafejufikifuxanizam.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/mizelibululopowizu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/resudorisarezabasil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=stock+management+process+pdfPDF 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_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10992 bytes
SHA-256: f363769140f93d2c5fdd3d280c63d820235ae5f79111d963fb5c4dd268a3c78e
font_01_sfnt_off0001289b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289B 17152 bytes
SHA-256: e1dd84eb607421a8130b5072635839cc37ad76f6536af12908c5cac59d607fb8
font_02_sfnt_off00015567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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