Malicious PDF — malware analysis report

Static analysis result for SHA-256 1034995be32b91fb…

MALICIOUS

PDF

82.5 KB Created: 2021-06-06 15:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44cefeb5f2a580b1e0fdcc9e301b6cb7 SHA-1: 31f245257f1b1f6d2c01d5ad3ce1c781d1bc3398 SHA-256: 1034995be32b91fba829b515bed096bd142e0ef308f4f8caaff185fbaddbed48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as a phishing trojan. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'grammatical categories exercises'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://laborke.ru/uplcv?utm_term=ejercicios+de+categor%25C3%25ADas+gramaticales+para+imprimir
    • http://cestovni-postylka.eu/userfiles/file/mitakujoke.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e49b75d9af4cf6df4d9d5b454aac5358/88534518576.pdf
    • https://ferado.vn/userfiles/file/bakidux.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092d6d549082---tijefofobubidab.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/5a8a15eb69ae98cf8ee5f78d656d6b8a/43904988537.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a636a27977---megegebezojolutop.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6aa7bc472c---vurorutirajorepusigega.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16093c927abca1---48552901696.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcae68e587---lujubenazutodu.pdf
    • http://creatinglifeoptions.com/userfiles/files/28159057627.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/f436e4d55221506fb1520880e60daa65/68476252771.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609542bb476c8---63262577308.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/fdbb4c9c9f0eea6d4f484dc843ae1a35/selusupamujivukevewebof.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab9b95bf4---92179504926.pdf
    • http://cezanart.com/userfiles/file/11824916274.pdf
    • http://curry-box-deluxe.de/userfiles/file/vitapeniniwam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101da.bin
3403f2443cd3160317ef246e40a30bc0e50d3c3f0e138b213eab761c04342466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 5480 bytes
font_01_sfnt_off00011474.bin
ae228a7b1e451666c0d5e1691ee053de05ce100709d60cd4fb2aff59944ee940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11474 11772 bytes

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