Malicious PDF — malware analysis report

Static analysis result for SHA-256 54fb78e1ffd982a8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 17:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f61d5cdcc96c9050e10645254354f42 SHA-1: 14d8e8f5e464d71406d59574248adda05f9fdd6c SHA-256: 54fb78e1ffd982a852d03b968aabd57af461227272f9b48b07650a15e7c33326
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=android+search+contacts+by+phone+number PDF link annotation
    • http://lauraestetica.com/userfiles/files/19913409949.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/89481844659.pdfIn PDF document text
    • http://furniture83.com/upload/files/60034596763.pdfIn PDF document text
    • http://pileki.com/imgup/file/bakefomimogovozolusete.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/dejatijewijaxuxotanogame.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2a0bc7ae---mejojipusog.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/lofijekig.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/26720558231.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8888ea2bec41f8a7e4c2e843c05d27ce/91000728707.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/66675230571.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/sotatulejezi.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/37378888803.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/94055885859.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/lolirule.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/39918205854.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sanowanepuwepixarilex.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/9601159181.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/31984861988.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/34844067838.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e80ed58b6---92723863318.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/63118972565.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gasuxilepeg.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/5bnrru0b57umqisdbn59h15mfq/miraginuxabutemidiwefaxo.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/wubabo.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/rigulikawapuw.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_off0000cdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EF 11068 bytes
SHA-256: e43f7500a2f56729dfb35600eb9889576005bd7ecdba68259ec940a510d92ad2
font_02_sfnt_off0000ff5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5C 18660 bytes
SHA-256: 216305c08c8dd869780091dc57256ceb9d5e2ec1ca03164b81a4d848c1523eaf