Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a166490493e946e…

MALICIOUS

PDF

87.6 KB Created: 2021-08-02 02:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bbed42c99f3f0049ca984035a2cb92dd SHA-1: efe1576665394e64b5fe58f01fc96f0e7e8928c9 SHA-256: 9a166490493e946e839ad868df255ee1cdb85788ee15aba05c5c2cd015d594d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://queure.ru/uplcv?utm_term=who+are+the+flat+characters+in+romeo+and+juliet PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0d91184ca982b97bbaf82fb519f586ea/29426330568.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/98784481857.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ab75ccc6c4f9e6cb4d4434a72b6eb941/pogikaramunigugivovi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/025d2e868aa2188bd78a88dd4dc750c3/sodotorasapusobejuvaxix.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/69452515829.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/42345421431.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/39931110131.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/57522299214.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f345092bf87e00fce5adb3d571aeff4f/mivikumivatovatemutimup.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffbaf43b60---tutudakalizotisebupi.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/mepipuj.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/lamotuwe.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160713e5e77db9---xuwagepazafitus.pdfIn PDF document text
    • https://ewt.cz/res/file/maveke.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021052417282873499.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/kijexugupezewojironutu.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/vegibesifumu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/c6ao6fc1ic6bk76fnbfj8dmbj6/jitejitokixifave.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a53b98d7b0e38f502d0b42ec7b8399d6/lisezesopagatubow.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/ghp23abkcvssj48qo9esjq73ih/46938892463.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5lkjic77111klnctabla3t47h0/1426205469.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_off0000f367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF367 10964 bytes
SHA-256: acc7b260428e07025da2d8ba0b5e6c9625e56985ea78657f429bc6a9b170a40b
font_01_sfnt_off00010c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9C 16904 bytes
SHA-256: a1eb9b6054de5528748c3a6859dc74a7408c19bf9bc12dc31835b80515572d27
font_02_sfnt_off00013878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13878 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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