Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb4ce3a167492d7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 21:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b17a964d01c35afd572954a4ed70fc78 SHA-1: 3ac0c7a204e06cc6defe11e3a42d0fe60e8f1700 SHA-256: bcb4ce3a167492d76e06dea943cb0827d97f589c2ef75e828f239fe4c68213dd
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The presence of multiple external URIs and link farms indicates a phishing or SEO poisoning attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.golfusa.be/userfiles/files/88294148618.pdf In PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/73569464033.pdfIn PDF document text
    • http://hibertek.com/image/files/20210715_170853.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a0f0782eb5---tirekuzoj.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/70153505010.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3ec5f019892b1aa70da5b602bc5bd813/xafuvifikekimelajewa.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160becd1ac31ce---33245854712.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/76644457580.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/rupezewatulinez.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/xopowopekaselotusa.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5d204d38cbb143d042b95c58ba92d464/24641160821.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/jugimiruxag.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/nojititutajima.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/38350213165.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/71291227044.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q00nsc7n1nk33tk62d8quo2lc0/59646580971.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v3c55hvint7ukshqlge9oavah1/dofugadaxeroruwuled.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e90d76c8ac---29675482950.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/39342689551.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/24816740744.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/1f8757806f82e7107dbfc79a885db803/91923024454.pdfIn PDF document text
    • https://digireg.li/upload/nopabamaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=energy+transformation+worksheet+pdf+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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 11176 bytes
SHA-256: 226f7e9be8ba5dba22117eedc362b96575a77c905a34fc5153aa864c78133ec3
font_02_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 18500 bytes
SHA-256: 5d6d2295de13cb42db19fe03a0d4903a3e5891ca9fbdb46b1183528dc19ccda5

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