Malicious PDF — malware analysis report

Static analysis result for SHA-256 5698b55aeacaf8b6…

MALICIOUS

PDF

131.5 KB Created: 2021-06-30 21:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8e8dec55cab979444f1b5312bac26ff SHA-1: 274c13227854f35f0e3b2878c94c52714463e743 SHA-256: 5698b55aeacaf8b6be8d6035980737683a9e2f51338fd5e9f94f996f462c7257
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6f174ad3---56947433373.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/be707edf0b39a22a15fe7a47f4b5308c/puwuxebewo.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c252f94995b---ninat.pdf
    • http://tahi.hu/ckfinder/userfiles/files/96435538942.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160add24889819---tixuranitufa.pdf
    • http://www.biotanika.pl/upload/file/garulogagadenabafavalogu.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/b2c6aeae34e56fb5607bd465892c01c1/vefebowupekasosuzape.pdf
    • https://sonarmusic.hu/up_image/file/daninosofawarunumaxus.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092550fc1e9d---85164515184.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3a748e0d---75694270604.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fqf86n3vd6bvhg9dkure7lktj6/42099814652.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/l5023q8u55ja1k7kcn797d9ibj/21455084434.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b738ae82be4---52156983631.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/86be0309bc1a9cf1cc588d0cf931c8f1/61436909667.pdf
    • http://spc1991.com/ckfinder/userfiles/files/84204792107.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076acbf9d1e4---29953880565.pdf
    • https://burstallconrad.com/editor_files/file/faboveji.pdf
    • http://bidmitt.com/img/files/file/88259706523.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/363f58ec95e59097943b8f2773ca6424/jixirerivodafomil.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160beb00627cb4---gazetotoxawumi.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/1005d95fb2285198ef7d6cf2c867c216/sonesazoputubiziritoriz.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/0ed1af8aa6b98bac673c0bf0f4080864/28818133519.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+enemy+question+answers+vistas
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a2dd.bin
aaa7b07893a2d695d512c457be4315399f31fd5aa693aa7f829eb999a55cb934
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2DD 10804 bytes
font_01_sfnt_off0001bbaf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBAF 16792 bytes
font_02_sfnt_off0001d3c1.bin
8992e8da33954f0a8ca6f1b3a3f2353e03e1abdd62b32c7c60255e61b81c3b06
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3C1 17120 bytes