Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b64f5dc6d0a702…

MALICIOUS

PDF

71.2 KB Created: 2021-06-23 12:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4acdd77d2e64fc78388dd7037f11c8e SHA-1: befa352b6f98ea83a1939c696fbd71392eb21c04 SHA-256: 55b64f5dc6d0a702263a086f55fde9874b8f39f5abe88eabe64be013015b1b30
156 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous links to external websites, many of which appear to be compromised or hosted on disposable infrastructure. The document's content, though obfuscated, suggests a lure related to 'food microbiology books pdf', likely to trick users into visiting these malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to distribute malicious links.

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://pixomot.ru/uplcv?utm_term=food+microbiology+books+pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/593isq1fqb0q6rsuoo1jgnegn5/nifipolipomuxekaz.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1dbe113a---69752703797.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaad1dcd34f---94535770148.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f67eb926---53803609080.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ee444bbddb0b824ce4cc962e0c7b1c17/4321854838.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160771e38de973---32994129132.pdf
    • http://adamlegal.com/userfiles/file/xajekimafunipedajat.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c3cee0b1---13125610054.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b780092cd---24110517419.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd604617fd---69278506443.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074accb8f5e8---fasibimobiberowin.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ddd9c4c9d---23247768203.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/btmh0u2p3f9trqkka9fl1ndcvs/3618957771.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e64d43e0---gufitemafetipukikipopoj.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16094721e27fc2---witebusafe.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_off0000d44b.bin
1f1a9afdb8d0584516f81df4ee329755252e916ccf6b2770e3bae29e9c3e2e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD44B 5528 bytes
font_01_sfnt_off0000e711.bin
e4cb2fbfe5a125e6c23e43c0c8d30ef0ce20c0d6a9252d01eb7cabdae3746bf6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE711 13136 bytes

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