Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe74f88cadf8e51…

MALICIOUS

PDF

88.4 KB Created: 2021-08-08 13:20:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e66e6ae0eee97adef4a12ebeaa27f632 SHA-1: 59e27002386baa97b6aee14ddc6c4cd6c7e1d5d7 SHA-256: 9fe74f88cadf8e51ababa19aa59c533ba4ebf28ddf07cc92ef5dbfb42aa6f409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage search engine optimization and compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=multiplication+table+worksheet+5th+grade PDF link annotation
    • http://expertsystemgroup.com/file_media/file_image/file/gomebexix.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/9cftef09mmstsrol6v6tubi7k7/56863182710.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/pazikekitugovuno.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/eaedf1f59be23da41d502f414dc94a86/16781433631.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/mvqu3erg7bos9rr14s7d9k9un5/31955279964.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/sarezum.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f26d66398---virerukakudisoz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f15d24241---26304324789.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/vuzazutiri.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/49964788433.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7a3200ba8---pevokab.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/75537442021.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f4236c6828e---fevusudupanotezaxuvotid.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fef2b035f---xidofutofazivobe.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/bccfccb311e3d7f18246432ecdbdd8ea/55189622035.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/57719864894.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/49456917735.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e12659d03---sepazatoxagegelokupotu.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/n2f5k1vv4d7ge3evv6totkc2q2/14735890234.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb235d3b25---30914187133.pdfIn PDF document text
    • http://climtech.com/files/files/18821683364.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fe5020eb7---pixofexixi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/22491582118.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d694fa1af081cc0527ac9e9d1787fca9/9906269408.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_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C75 11340 bytes
SHA-256: b8ee5176f088330ad253881d87b7f7019a62540d0f5d5576270e4953931ccedb
font_02_sfnt_off000126c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C9 16768 bytes
SHA-256: b747e689a311b0df2651e0754ceb7559f83a00021b8242356c4dc71d9b24925f

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