Malicious PDF — malware analysis report

Static analysis result for SHA-256 44ee3086e14907b5…

MALICIOUS

PDF

81.5 KB Created: 2021-08-15 19:02:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94d0bb7bea158cdc0bdd1346ae846f2f SHA-1: 2f383a84b4e377b05bc83bb6e6f516e6c0a3f106 SHA-256: 44ee3086e14907b5e10b8ea2789d5cca10c0ed87a1ea7b8d9393e29e0cfd71e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous URLs were extracted, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=can+vocal+cord+paralysis+be+cured PDF link annotation
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/nadugedu.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/31658389767.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/18105685657.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad591dc635---zixanupojakelewos.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607849c76045e---jazidum.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/gefiwaxopizubamilasexid.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/48cfa96311805c83a70c34ee5eb0ec4a/80424396310.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1820e8a947011d760d4ab3053b095d5b/nerosifo.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/4162583328.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16086335636acd---80717318258.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/220056193568.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/zozafepesu.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/8si3qif3i7urcs4juaedljob03/resalatum.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/245242c4bbf95bc50731843c683324f3/peburogajodusexamomus.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d3020ea2dd9ee8055245beefc156868e/84341943515.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77da2d7dc9---bitesijo.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/17146397422.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a01ba8d99---32410446796.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/tamimokigazamabaz.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///somibiwazawo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bea7ce9cd32---97633962853.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/zepubomusilox.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/44156375778.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/tamuwuvami.pdfIn PDF document text
    • 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_off0000dc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC49 10860 bytes
SHA-256: d8cacf0d5080f8cd3c5d8669506e9135ccdc126e249c6e696a513c9eef6e8d3d
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 16036 bytes
SHA-256: 5851342ca25df9f113b3afc64d834dedc24610b75b89a421b0b5ce306c26af82

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