Malicious PDF — malware analysis report

Static analysis result for SHA-256 184414208dc54aa4…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 20:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a9af1b65d87f7f41b4df22306825f554 SHA-1: a8a706bd8f44dfc670782f601ff53efcae28192a SHA-256: 184414208dc54aa48f56a15d101a777b4558cb7f72b7b25e1ad0df0e16c89696
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted from this sample, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://minerva-collection.net/files/files/fatunotapakuxarip.pdf In PDF document text
    • http://nessium.fr/userfiles/file/kufomivowamufejozenu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/2139381701609571af34f02.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/84435868324.pdfIn PDF document text
    • https://energooptima.hu/upload/File/73477398720.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/rosisujanirewiru.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/597b2b50a1de3b460064bbfb9b3b4716/85806485707.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/jupokuleb.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/40c8f2b0435a94145095ef76fee567b7/govapunu.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/15970752731.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/33379938871.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae678a0480a---mesibi.pdfIn PDF document text
    • http://nicosiacaffe.it/file/zusaberawem.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/45032148272.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/njeqloud6dobs7at1q3ukmsnnr/69708565734.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608263e07063c---49367828906.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/zugovona.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/piwiwudobijadunixoxe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdd906f241---22874259992.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070e81d9f668---40094219865.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/xidujetolemawulefube.pdfIn PDF document text
    • https://taperagi.com/contents//files/ninorupekamapavifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=c%C3%A1ch+x%C3%B3a+t%C3%A0i+kho%E1%BA%A3n+facebook+tr%C3%AAn+%C4%91i%E1%BB%87n+tho%E1%BA%A1iPDF 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_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 12056 bytes
SHA-256: 57c3362ee43fd97a9818bb24ce1453e7156266f028d2d641b758a0a82e753e9c
font_01_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12400 28336 bytes
SHA-256: a5bc46ff1c0bb46f5851e3e1ac816a9fb3be4600f7dd9e05c7edfa1f936de7b9

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