Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5aa5c549cfff7b…

MALICIOUS

PDF

96.7 KB Created: 2021-07-02 02:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42693a02d13c6bccf38db509688fc9e0 SHA-1: b60af9f4e67b1f810acb671972893239c876b848 SHA-256: 9d5aa5c549cfff7b574961d3289b0860abce62b11a1019d10853f05c7accc337
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous distinct hosts and URLs pointing to PDF files. The presence of multiple PDF link farm indicators suggests a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/cf03cbb4e34dcbf7c92bc21939f819d5/xujixevobelegimiwaj.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a460c4a0650---61629381076.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160922d9a86ea0---bobejibaturukaref.pdf
    • http://irk-yoga.ru/upload/files/raxovagowiwutad.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/e128cf04607f4ae115bd5973b8498f7e/43615160481.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609227499fab2---jesakevifegi.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f000e0605---jimaxefiwegodobunefolek.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9i33g15u5k325gi9adgfrgotmo/rumobarikodivenud.pdf
    • http://vietthanhstone.com/images/news/file/41410769527.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ke7ivk6gmqku1flsaglpb99jrd/sugolalamevokefozotiz.pdf
    • http://normel.org/files/upload/file/2275248713.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084193e3cd8a---6732426733.pdf
    • https://meganimal.pt/site/upload/file/64480507111.pdf
    • https://ahha.az/userfiles/file/35688142941.pdf
    • https://rrr71.ru/upload_picture/83670644144.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b6f9eda99f17c524e75565ad98877c75/zelenipa.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/18klaag6k1f25uhbm7fndofkns/39888088540.pdf
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/321944bb2d92e659a80083e9fa1d1d11/xoludadowipatakaxo.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/7b02e242a6aca6c827610f013925133f/jajutojewamejowixobubudok.pdf
    • http://bjhtdszdh.com/v15/Upload/file/20215211537173922.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9237aacb54693378d64705fbcc50b393/39755908239.pdf
    • http://absolutelyneon.com/userfiles/file/15533351590.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/3247ai982mevba219pf0a5iq7s/71637714190.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6075117a0---5171223287.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=blood+pressure+during+angina
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001020c.bin
aa589a3ed05d951599d06e093d935772f9e87e67a8352abccba89c2a1accad9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 17388 bytes
font_01_sfnt_off00012f4a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4A 16792 bytes
font_02_sfnt_off00014761.bin
76d40a20efb5ce62ea7d71e719e22ed74d717fd8fc497e94110ed0405f5f06b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14761 10620 bytes
font_03_sfnt_off00015f7e.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F7E 16164 bytes