Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a09a1273154245…

MALICIOUS

PDF

99.5 KB Created: 2021-06-27 00:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ba611603dead153703cbf293a45f2eb SHA-1: c4dfe108a55f7960ac4ae9bf786503a67281b22e SHA-256: 14a09a127315424558defe04ed13feaa226174382cb543d62724e9c17cc364c7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The primary attack pattern involves leveraging these external links for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://laborke.ru/uplcv?utm_term=evergreen+niches+for+print+on+demand
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50f5379a8---25391893723.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba015d2ad20---zunerapogivij.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/92f1971aba09e384a7d4161a3f961e32/23819737039.pdf
    • http://www.allatpatikapecs.hu/images/file/fupem.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fe0b221a---xituwu.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/h2715pvujvisrqr5okgde6eg2a/47250692705.pdf
    • http://budaikepkeret.hu/uploads/file/13599948158.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8be34b6300---jiguwumetitab.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13835ee761---tiwumopixozidezarinuwa.pdf
    • http://amadpich.com/userfiles/file/32041322591.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3795af2db---93838157325.pdf
    • http://lapenya.cat/imgjovesnaves/file/87060425856.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609995cc3bbfc---lejaruforit.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mazowetoregojuwopiguz.pdf
    • https://travelsafeway.com/userfiles/file/44917854339.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c7dec45bb18230254d5a002ea801e9ac/3587001681.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/816935e5eb138dea20f4242bf978a614/bumofakixulowaba.pdf
    • http://aaaexpressac.com/userfiles/file/bufafubozewuzo.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1cd67d811c---fojejeviz.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hn3bh5iqr46kkl4pgsh65mtmko/pivebozezapipim.pdf
    • http://ipublicity.cz/data/file/midesiredoxubufadidober.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/ad18e535e7326232894da185301997fc/voguwigumuvu.pdf
    • http://oodow.cn/upload/file/210617011238885493o1gfp5mb6n4d.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_off00012205.bin
f724314c94b0b33e10a2c1ad6a01743ad32109bc17232012405bbea1065ea9ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12205 11068 bytes
font_01_sfnt_off00013b69.bin
6afbd291820d9bdc2935e344383e2db9b8deef3f7570c9b46fabc7c08210786d
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 17392 bytes
font_02_sfnt_off0001689b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1689B 16792 bytes