Malicious PDF — malware analysis report

Static analysis result for SHA-256 071f826cbc01e9ac…

MALICIOUS

PDF

110.3 KB Created: 2021-08-24 13:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 952c120a2281a0b8ae3bb65509a1a17c SHA-1: 930be60e80ad153c575a183140e808fd87c3bfcb SHA-256: 071f826cbc01e9acd290bee1b119bc6c547391f8197f560eceee338965c035cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous URLs suggest a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2f6f54e0c8---leluwolizifowebizo.pdf In PDF document text
    • http://studioaba.net/userfiles/files/tasirasotugivozoreperirow.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/41768681771.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/defililigonos.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/vunetiteseropikavopuwa.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/pepeziraliva.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c93fd80982059a9e8a45d7d5734dce7f/bifaziruxi.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7dda2a924ca138af70c0c3832c89ed4f/tufusimexutu.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0df6990bc9---zizenoriri.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e49cb443---72391895759.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16103b20ab351e---50533324334.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/nevetelub.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b354e37932a---78969727165.pdfIn PDF document text
    • http://cokhisah.com/webroot/img/files/jimudaruvenaf.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609855c8259db---wawava.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/porudasewur.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5r0g0dt0mn26vse95bcsujns4b/97695139649.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/33641622266.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/namemadazexekoxilajiw.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108210548372138.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a9901bb4909---gaguponakununexurux.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/toxirawaz.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///wodadexex.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/lobudelege.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=try+square+meaningPDF 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_off00014a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A9C 10512 bytes
SHA-256: 3cbdabc1c4682d90a90affdfaf7afa25d85718afb2cdee4ae0bfa78215779679
font_01_sfnt_off00016227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16227 18256 bytes
SHA-256: 6b1ecf76e14bdaa12451b36043206251d44e73374ab7291b125c238df76c6bcf
font_02_sfnt_off000191b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x191B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1