Malicious PDF — malware analysis report

Static analysis result for SHA-256 affdb3a37f7a5ae2…

MALICIOUS

PDF

87.6 KB Created: 2021-06-26 10:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69ec2cd6160f3064ed7465634e1caa79 SHA-1: 1935c0a4206514d2d908b65db401eab48c95c3fc SHA-256: affdb3a37f7a5ae2054da296a21a308a69f6a1f114617fa182a5c6368376d6e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by multiple heuristics and a machine learning classifier, and specifically identified by ClamAV as a phishing trojan. The document contains a large number of external URIs, many of which point to compromised WordPress installations and disposable hosting domains, suggesting it functions as a link farm to lure victims to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=almost+fainting+causes
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2ac7271d---valenijipinawepu.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e28a61494---xojugap.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851c21a72b5---7309877251.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d25d73260a5---73226488401.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/5f3081bcf663d127da98c4b2b64a36f5/60244598523.pdf
    • https://firsatpin.com/calisma2/files/uploads/semudomemepi.pdf
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/qpljuu4ia0kjgo6pl04kdppg29/82622085661.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8efc87845ac8118179598096b643ce93/69943515889.pdf
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/mokonen.pdf
    • http://sujitonweb.com/userfiles/files/32340699901.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff4d1b769b---nanap.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/94330565dbe365d01874e92cfdf143a5/80735579681.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfd78c1d2---92338350356.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2436355199---93572297675.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075957706dd2---79771664466.pdf
    • http://zafirkort.com/uploads/files/detelosoranefabag.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160759c9ee8cb2---12500556023.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4362984a0---97748267430.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb127b09d3---dukiwefamekixaw.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794088a8b12---85658820723.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d79903f00956eece0c9fedb257d8ad98/janubezepuvewuwala.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086656d2595b---vitifetuzud.pdf
    • https://aparcaderoshaddaichile.cl/uploads/images/files/73167480775.pdf
    • 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_off0000f416.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 16792 bytes
font_01_sfnt_off00010c28.bin
00f29e9206750131098be63a20815a31ef6513ec6c21dc069c6916f0509da3d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 17092 bytes
font_02_sfnt_off000138ec.bin
8a19759f8d2233c047d5956e9a59e4ff8b0829e8ffdcb0be4fe916cc2959d7a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 10660 bytes

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