Malicious PDF — malware analysis report

Static analysis result for SHA-256 afba746c7bf1aff6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-06 20:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c947bd9158afa160488cb4d82dd59e65 SHA-1: 1791b6b2bc3d08b5699845d3ce0930b3b1bdd91a SHA-256: afba746c7bf1aff638f7e9526f51c02b44479bff612c48639bf4377af762c780
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2ae39edf---22953474771.pdf In PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/911b55baba954f8963694c153425d24c/56008626298.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/83938mrj0si2o1idfdhggg1lku/48904599794.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/220740344779.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/32777368254.pdfIn PDF document text
    • http://varosom.hu/userfiles/files/bogumafajunazumuwu.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vinel.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/noxuzemeledemozazawe.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/35149869322.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1eea05f3b565f118765526002dba449b/foxilepuruxatezarokofewuk.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/xupogikal.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/4370272593.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/97982518166.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/c5uhqb8f0qknti50jjv6fsgq2o/lomokenelexugolonapab.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160722ad013903---pipur.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608084946ab7b---bilupexozox.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/32ba711a349d7ba2bee49f0c880839b0/tuzafalaxibilazifalubuk.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/94986621271.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/53505131730.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/43636035227.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t61dffbbdmen6d3f43kp82o207/90358340379.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/rusutiketolavapu.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c86369ba5---vijokevewup.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/bopukivupixepepezixubam.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/55440185396.pdfIn PDF document text
    • http://robbes.nl/media/files/womekaxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=pdf+metadata+editor+appPDF 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_off0000d67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67A 16200 bytes
SHA-256: cf4ada87ec01c6db5b4eb4d9f05cb7e989dfd3d3f75b4325ca1dcc52f435f240
font_01_sfnt_off00010074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10074 10340 bytes
SHA-256: 7e8793a9024546a0d97e2d63ba30f6bc151bdcc9b04be9432ed06c260c0112e9
font_02_sfnt_off000117cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1