Malicious PDF — malware analysis report

Static analysis result for SHA-256 2910ff3438636e65…

MALICIOUS

PDF

91.2 KB Created: 2021-07-09 03:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d4331df21766d17eb2ca87226ad0a1a3 SHA-1: b39896732a2c75a4a8805ff8c751bdf9faf69407 SHA-256: 2910ff3438636e659a5188a6ee9166d68d56b8ddf8d966ad218398445a65cf5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to lead users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kpotplace.com/uploads/files/24398503025.pdf In PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/lojojo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3395b5a508255e5322bb9ded4c9d27e8/rotupexofimofuferivitemiv.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87f43231e---10440182310.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/gidofaja.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/89966141907.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/36c45e4fc33fdd6f8a4d1b379f33a5b7/60867598674.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/14068095862.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/dokinakojoru.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dd71c4def326bfab86222f7b5aee2a7/12682309148.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/720eed464f8309a4a0ad040ad87499f1/39335851354.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/33ca45744d8495507a6ad9b714a8ee67/pemasozov.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/196789983660a3f800cd7c3.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d111da21b8---rorerugegagijitineketa.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pazetofisebajudagotejufa.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c924b3c5581---31781516774.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/3lel6s0c3des6a4g89ifm2e20t/71938168758.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd3a46d058---80252303997.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/kilokora.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/jirogofexeladoxox.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8de9294525---84985818772.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/dupomed.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2c78ff14---27011662535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=tremors+are+caused+byPDF 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_off000102ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BA 17212 bytes
SHA-256: 284198e511ccd055aeda236f235c8149af8ecc086dca94b83fb46a2cf0b34b5e
font_01_sfnt_off00012fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB2 10508 bytes
SHA-256: d4388fdd9b996f7b6a42ca204b87938a074a3763c2edd1561c05abed5a6d058a
font_02_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1