Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca96d8e63941673…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 09:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cb4877034ffe30d552edd4943860826 SHA-1: 6a8f46994cc34d35eecb71ca46a011b5e58bbe13 SHA-256: 9ca96d8e63941673c3aece8c4b9a69eb166e25005e61e378a20fb96a71e8abdb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Numerous URLs were extracted, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to lure victims to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://sherwoodchambergolf.org/ckfinder/userfiles/files/vixosilinufexa.pdf In PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7207d1fff9---femivatarusat.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/jijilipet.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/koboxopukurat.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/53250011716.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/lovepe.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/95906696811.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/xizesusafiwupojowetu.pdfIn PDF document text
    • https://verner.lt/images/files/maxemelun.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613171916ffff---40202297574.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/rumikodeguke.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6eeda22bb5558e136cd935bec22e18fe/51498402185.pdfIn PDF document text
    • http://lachina.cn/upload/file/jegokezemudov.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/voduzumol.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/wujuxikabifovopo.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2qkj7r6siv4h1oc6nuoa35qgmh/muterurariribon.pdfIn PDF document text
    • http://irs-messtechnik.at/upload/segepibetigor.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/74724533216.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/69145937562.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/636214d0d7c9d54183bb2e10aae71abb/99160556272.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6ec02a815---9372821709.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/gojinovizun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=principe+de+fonctionnement+d%27un+moteur+pas+%C3%A0+pas+pdfPDF 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_off0000e370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE370 20388 bytes
SHA-256: 37596c5d80a58e7fe9f488b557f65cabc3a6408699ebf8b2afcdfa77393c6cdc
font_01_sfnt_off000116ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 11052 bytes
SHA-256: cf2cbf55020fc2d613c87f15e88e3c81d14133b8f8dc56dd27974477e9b6ef67