Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b1126dd5bb0033…

MALICIOUS

PDF

87.2 KB Created: 2021-09-07 20:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 70d7dc4e3dae77bfd192d150471acdb3 SHA-1: ae8799ab7177aae00800038e0356a512b30dc77e SHA-256: d2b1126dd5bb0033715da1fdb58b2bd3017698640906e9fc04b0899da02b7817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the nature of the URLs and the 'link farm' heuristics imply the document's purpose is to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=spectral+relaxation+method+pdf PDF link annotation
    • https://iqmuseum.mn/uploads/files/20223438265.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a479a4d12c7---zilege.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/975524499.pdfIn PDF document text
    • http://texmet.pl/userimages/file/71156579649.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d6fbdd08a---15308961183.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078ad65d5e70---vamijabuximegefonaj.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33419a62a---99416505161.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea785aa28d---gotasuwom.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb32d615b1a---62494474452.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecaf188e2c---32735305507.pdfIn PDF document text
    • http://bjjiffy.com/upload/46483770656.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/rotibokikutarununefalanam.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/0ffb6dbbbffb675c8c417f09757eec39/19848861706.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/41692640450.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/89262258503.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2gubbpb802ivn3iri2utgn6k0h/94636769768.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3359b7bb1---wejejiji.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-18/20210518213405858375.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/bakejofarujabulaxu.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/joxobowusakef.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/9566466550.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/9138618575.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/8145381504.pdfIn PDF document text
    • http://www.toptehnik.si/images/lorufafilekabavuzefozum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0F 10896 bytes
SHA-256: 002d8920bd35b173326438daf128c2db99525056f35808b85a61563fc599dcae
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 18628 bytes
SHA-256: 014df813b0785baa72cba8d141029f7710796a138e7eabf2dcc500a5cc1c3398

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