Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a3937746564ba6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 23:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 849a3d123210f72abbb3c9fe772238f0 SHA-1: 670feb38f44b1b8382435ca0f60174d3f5dad83f SHA-256: 38a3937746564ba65624117a0a387a2d2a78ef54c4f51abfc09b33d8f6e3b030
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gikguamerica.com/userfiles/file/61479322929.pdf In PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/zubugojolimabosital.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/70576252640.pdfIn PDF document text
    • http://landpas.pl/upload/file/17177139444.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/fitaduwu.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/surebazuxezovilenot.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd2fe9c08e---gejugujuvigupozuzojujalet.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/45262231403.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cc83c5f88---titapinodupetuxuno.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/raxikokuzeb.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/68662738622.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/93004991883.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/vomesivapolofa.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/82322327973.pdfIn PDF document text
    • https://ijp2.com/contents/files/40946866308.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/vitegerarisipad.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210911_015247.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/sisexesa.pdfIn PDF document text
    • http://amandamaitland.com/images/file/17240425633.pdfIn PDF document text
    • https://maria-galland.ru/files/file/52630801484.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/rilita.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/46025322910.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qtcqoj4om70373db2h49ul3l80/fenasogifusadotizesixupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=redmi+note+10+pro+max+vs+poco+x2PDF 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_off0000d986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD986 19756 bytes
SHA-256: e1cde5b581a2f14e51e5e5308b3ed0924b7e1aebc10add880538d0d98db98adf
font_01_sfnt_off00010d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253E 11136 bytes
SHA-256: 8aa723026e6ef2d0bfb301f1de12b563208157c3aa0e07a0ea0ff66d92c8e851