Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b2cbf72ca5538e…

MALICIOUS

PDF

80.9 KB Created: 2021-07-28 00:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f646026b64d1524e5d30fd4a39989fd1 SHA-1: 737817d93a23759d153e00a97d71ed25ac5cf00c SHA-256: c0b2cbf72ca5538e378bd2562aec69129354005e4eaee642bd38ec5e61dc5e4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cplastik.com/data/cms/file/rovanidurevadizajisoro.pdf In PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e7466bd070142e2ee8e0c25d84074222/34310974625.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/56366122156.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/wajiki.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b82027e---kojozisev.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/664272292.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/33092161678.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836ad416adb---xepalaju.pdfIn PDF document text
    • http://woorymart.com/userData/board/file/48931456133.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/h9005m3f296ud1depkerqa0lp0/49518284284.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607607ffd32d8---58181692328.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/95953046155.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/17927901869.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40b7bb187---34585187108.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/8e663e8a9b1e62ef546d7592be136d53/79220145171.pdfIn PDF document text
    • https://hoalavender.net/upload/files/68690106232.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/jukoxokox.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160761feb36ba7---14997728162.pdfIn PDF document text
    • https://makenie.com/upload/files/62139939318.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/gitejepewamowadaxe.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/tanufametopobitazojaxel.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/49478272972.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/77016551399.pdfIn PDF document text
    • https://actor-conseil.com/files/file/vigujivadawudofefivuxe.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/454678c82dc5f0700b33ee4f22f5981f/kesafonexurorulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=i+watch+series+5+44mm+bandsPDF 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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 10860 bytes
SHA-256: 92966805f850f3776264c0f70551463b7a74bcd1342c70fb1882aa3d407fd136
font_01_sfnt_off0000f26a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26A 17056 bytes
SHA-256: 1c80bc55d47068ae94da714fe9d01ddb120f653901d34e4f5810d854a6778a46
font_02_sfnt_off00011de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1