Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01edbe56fdd45bf…

MALICIOUS

PDF

89.5 KB Created: 2021-09-19 09:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c09b35656260156faf1c6cc29f7053b SHA-1: 24a6f629e9e00aa9b92f7e4e5f46a9acec1925cd SHA-256: b01edbe56fdd45bf3df4167ae684bbc5ea632587166161a6faab4e81f49112e6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://gianenricofabro.com/userfiles/files/77103505159.pdf In PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vedobikilolujox.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/5550614582.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/47450734613.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137ca2343593---gozav.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/kututopopififusi.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/xajaminixozaxafedotamefe.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogatalazeg.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/28397030105.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/tozuxorod.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/58942540174.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/52952147370.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/95461077883.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/51073538005.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/zonisinajevakimajew.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/25877439421.pdfIn PDF document text
    • http://net-marketing.hu/images/files/doradudexatonuxorasuri.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0c2da276---9517850758.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3844d1332---68041400934.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139beb9b244f---12258505348.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ae39f47fac35460c2c630c0b9f9220d0/42741487475.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/30183401176.pdfIn PDF document text
    • http://aven.su/userfiles/file/fokejokizutagikuruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=hungry+shark+evo+hackPDF 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_off0000f71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 18996 bytes
SHA-256: 8b4d8461a4f712076f805a63bfa26fc07ea898b9c7b5b3780f54dbc22a25eb98
font_02_sfnt_off00013fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FE5 10636 bytes
SHA-256: 26e48910fea500f8e3e37b71d85906d7b14aec4ddc1418cf6fdfdd0e84ef8679

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