Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cf5036164b2424…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 12:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 451b9ff2dce39e544d2a316028c58578 SHA-1: 990f2317cacf48c2a2b07ebcd61b5831572a6609 SHA-256: a9cf5036164b2424fc16b2938f0f1a809a7a148fc12ad3e8c2d0a5f4896039b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. The presence of JavaScript indicates potential for further malicious actions beyond simply redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=sql+server+learning+pdf PDF link annotation
    • http://woodlandhills.ilovepokebar.com/uploads/files/gelegojuka.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/31630792161.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6c5b52546---22747499020.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210923062347.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915234451315419.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/58705589563.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/cds1hbnouv3fjhptmds6o5v42q/larebeximegu.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/povaguzevo.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/39410259749.pdfIn PDF document text
    • https://kiptep.ru/file/97791522783.pdfIn PDF document text
    • https://ijestr.com/ckfinder/userfiles/files/41675878209.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/furovofuzukuk.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/riwaza.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sopoj.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/jatixadekufugiwax.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130417aac633---naninasumopiduma.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/81015767731.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/pudak.pdfIn PDF document text
    • http://receptlap.hu/files/zokigagogisexebepotumazi.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/2627125884.pdfIn PDF document text
    • http://asvpp.fr/pdf/56450139228.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/1f181dea9e96f4c61cc23a8f3174e42d/toxedaromebosadure.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/75743072165.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/92021682283.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/tegivilavotumaridanutopo.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/tarexadiwobilezabenolojib.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 17128 bytes
SHA-256: 91b90053a257268c7444a7c9683a83a006387084ec78107b421e12e56596780a
font_01_sfnt_off0001092f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 10744 bytes
SHA-256: c4c875e429cbafa9d979b47f98694224b156df920d9f4d4df9f2b62160d2d9da