Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b95c5dc248d5541…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 15:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f60d26db74aec2fd0cf72580e8eca6ed SHA-1: 62868cd02d78f9e5d733b492a1442828da1c50d5 SHA-256: 7b95c5dc248d55415bb07ba1147dcc22d1c70bb54eea0926c3344a3fe99a6542
164 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to external PDFs hosted on various domains, many of which appear to be compromised or disposable. The presence of a 'Fake invoice / payment lure' heuristic further supports the phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://beta-rc.com/upload/files/fifux.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/3ea05a70514ae7b17f9774de9ad853f8/sovazojatogegumup.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/67776787805.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/98935640809.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/35305084039.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383c8b12a33---nidizuperi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614193b2600a5---monobevosazod.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140e61148d58---52979258263.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/xujararezijujonarudipe.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/38947983074.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilive.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/rujidelesilevinagi.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/mubiwafofezeze.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/15126035574.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/pevabadebavawuxajifexuw.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/ramubafutivuzalux.pdfIn PDF document text
    • http://thesei.com/In PDF document text
    • http://robalton.es/Albums/images/file///16124850019.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/kekegegobonenezij.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8688455d3d45d6d229976135adabf0d8/nobaselonobe.pdfIn PDF document text
    • http://hzqzg.com/d/files/97666219707.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/87981534527.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/waguwor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=see+what+apps+are+using+battery+androidPDF 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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 17084 bytes
SHA-256: d9cf9781eb5d58694347cb5ffc0dbaaf832a7962c30eeb234f6160a0cf9743e0
font_01_sfnt_off00010639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 11140 bytes
SHA-256: d7fa677c9699b8e3db15aff6acc90135483eecaf4e56e15b951fc12d9ebb55cf

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