Malicious PDF — malware analysis report

Static analysis result for SHA-256 7127df680ddf45c8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 09:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 53df59c2a9ce0d0925edc751e9c6eeba SHA-1: 8265a8edce96e63e02b50968188886dfaeecbcf0 SHA-256: 7127df680ddf45c81f81f5511bcc61665264cf7a51640449d45d38e3fbc0e89a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://fsoa.cn/userfiles/file/mozezalavo.pdf In PDF document text
    • http://vce34.ru/attachments/file/75609303261.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/tikekinekakugurez.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h3kpkmemra87r17qk2v9a2n508/1366934507.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc074ce23d---14114866960.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160926d6d18be3---ditoxi.pdfIn PDF document text
    • http://yilip.net/userData/board/file/2557436531.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/16902278648.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/98166512342.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ff30078f098---53843623249.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/zalavumokekewigobawu.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610cf720a919a---kapad.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709dbd70ade---18004767726.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/beletifov.pdfIn PDF document text
    • http://redactron.com/userfiles/file/niniwamex.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3d4h7n202n7qmm7gbfl36345m3/93471813455.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/48473577111.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/3mucv68f3e75ifmh1gae0nqul9/wuworatezos.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pozaw.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/98907674871.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/59101056463.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/33535608850.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/momepom.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/vimitijexiso.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/4fgvdgafv2e5vga4amfip84ln3/77834495865.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/56245686212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=electricity+%26+magnetism+book+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_off0000ded6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED6 17440 bytes
SHA-256: 104c4bcee571038e48d488a905633f4c71f55acd81ab52957a07c4cf7ab96afa
font_01_sfnt_off00010c3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 9760 bytes
SHA-256: c6c2997759755c5b68ea52b60bafa93eea691d00971afc29b3ea5a39eb0ded8b
font_02_sfnt_off000121a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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