Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9f921810a9ca88…

MALICIOUS

PDF

88.5 KB Created: 2021-08-12 17:06:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c95935f0ca2d37508550b5a1ae01a597 SHA-1: 321cd157ee8628aaf3aee17f0bda54b6056d42e9 SHA-256: 3d9f921810a9ca882498395c2243ec530799113cca6f86159c2ec30664b521c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm on disposable hosting, with multiple URLs pointing to potentially compromised WordPress upload directories. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://universal4shipping.net/userfiles/file/gamozokologo.pdf In PDF document text
    • https://cubic.is/userfiles/file/diletuzofifitivomiwejuwot.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/watujazakajap.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079a35865275---39701140045.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/6875465770.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/6127626776.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd33a49cc---50129784613.pdfIn PDF document text
    • http://sam-global.ch/files/file/gajexinebelinel.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lufozo.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2deb415abd---winebudekusipizimo.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/8e9o857tjuidf1qrvc7l2gqhtq/25816655482.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/wofera.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/jufelutiw.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105997420c01---9010941268.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1bcc5e29f---84093668742.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/jeduwetedavagana.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/2bd1a58106cfae1683d5051038545fe8/databufedobibeza.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a58dcba623---5103400410.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/buvesipokugirudewon.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/noforituruvejogugevus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ejercicios+resueltos+minimo+comun+multiplo+y+maximo+comun+divisor+6o+primariaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FB 16160 bytes
SHA-256: 5c13cceb9d36bbc2bc20aea0fe1d16ac5c722eae827defaa6d249ccd2c25c082
font_02_sfnt_off00010a7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7F 17632 bytes
SHA-256: 9b8255f3f199e439666187503a225d793bdb6cc3741f3242b0c90ab44b045580
font_03_sfnt_off00013662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13662 11340 bytes
SHA-256: afebee1099054f9d358d9f61106e538e07c0773e78d16aa86d992bdcade59f00

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