Malicious PDF — malware analysis report

Static analysis result for SHA-256 974ab98bd23eca26…

MALICIOUS

PDF

132.9 KB Created: 2021-06-30 10:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 155192e929571479c8ab92141bb091bf SHA-1: 609246a91fd40c9e733d0afc15c92173ff902cd7 SHA-256: 974ab98bd23eca266732a294592f21c185f182fcfe5b3126cd45f8d17689f86f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, and several of these URLs themselves host PDF files. This suggests a multi-stage attack designed to obscure the ultimate malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9723

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://archism.ru/uplcv?utm_term=challah+bread+passover PDF link annotation
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9jof9smcjp9226m3mr5vf4ni8f/wotifalujepopokumovemep.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/69135522879.pdfIn PDF document text
    • http://dajuicebarus.com/uploads/files/pajavarawanodovebim.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/lajaririwabus.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bukaler.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/oqfumtp6hi2ln595q0d091clf8/xofexuw.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6ed91c0fa---pagek.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210615171923.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7c401804864581586bca1dad5798fd75/80389472156.pdfIn PDF document text
    • http://bdn10.cz/files/file/rigutakobiwef.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4db7b447---16385908313.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/dazugokakav.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/velisomiwiveki.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a98990e4---vajegafixekutivuravub.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/ditafemudaba.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/baminudivixofoxuxetus.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/58072598416.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/66121478538.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/c1ee85f07e927b2e74de4f67595978da/19208470778.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccf3049cbb---34939731106.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650cab775c---53903711962.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c102bfee75d---lajobonaturipuzi.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/a605d38a828112af3ef82108d3da8a31/62001637017.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/raresib.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DF3 23468 bytes
SHA-256: 9eccc06ee452159cb5d584caefd924a13c7708946131609708142f6f373a1b4d
font_01_sfnt_off0001b78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B78B 18768 bytes
SHA-256: b5a36ce16428a179a82ba33499d4d171048f7a11bcb6b9d38e858fa2db87e7ad
font_02_sfnt_off0001d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D694 10432 bytes
SHA-256: 02221e4ee53ea85860301f7e0e41eba125058a5ae65e889c65d9f091ede767d6
font_03_sfnt_off0001ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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