Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc80c119c48137c7…

MALICIOUS

PDF

70.7 KB Created: 2021-07-18 22:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 821d3f63e74d8459f961a2ea7f76c281 SHA-1: 1c47b60ffc31e7f80aeee33dd1c3ad8a37f9623e SHA-256: fc80c119c48137c7c948c4777fe82cfa5cb59dfc4bd05b43f2ebea9d089c55c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42aa7016f6---89661332154.pdf In PDF document text
    • http://thamdinhgiadaiquang.com/img/files/kuzakagagewesuselepalosu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/57573702182.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/31525993575.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/vabefa.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891c451920---50246198195.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/21738743243.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/vogovipepuzabetezotofet.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083e8e021006---14379641881.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/vedapasujo.pdfIn PDF document text
    • http://prmakeup.com/Image/files/8420377740.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/dimagigixexeruwiriv.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96524974592.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d49cf8a2d1---ferejosus.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/61j703tlon2et8jcqf8s3u3g46/wekafewafu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/t6hj0nss4oooic3uhc7tdn68d2/63258360854.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/8bbaa344ba164c1a5bcf0a38cc4c5ca8/69935819847.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4fd54bc590bc0038424119751d1b95ba/93053684176.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/20028808676.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/64119131634.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9e264b6f---37508507886.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d88f3da5d929fc8b527d7dd9a457bf6d/vokufolofukorutovabudoduj.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4aa2223b6ddd74a6afe2cace5321e753/pibixepofulara.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa19b0d81---38910470314.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609056eb9dc7b---99934599700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chapter+12+circles+test+answersPDF 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_off0000b4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0C 10640 bytes
SHA-256: 8779e817a6670f92eff9aa937f1572d4c2102587439316878efd480f19480521
font_02_sfnt_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 15492 bytes
SHA-256: 9074101d27bc7679bd35506ded3ce266eda8853c089742137e931fdb22c19b48