Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a9c6e0a22bbacd…

MALICIOUS

PDF

96.9 KB Created: 2021-07-26 06:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 288ab2a82b405889a61bcd73637e6675 SHA-1: 66375a0cb8204c507f65154780eef3e1aa382119 SHA-256: 73a9c6e0a22bbacd6b4cea09e843178094f577234d85b32e6949b722692717b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites. These sites host further PDF files, suggesting a multi-stage redirection or download process. The presence of external URIs and link farms strongly implies an attempt to lure users to malicious destinations.

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://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/66d0fa6b89cad0d8839ab10e13f3247f/27580846373.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/88753896850.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16081b09f95ae0---nanin.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000267860f---25560788302.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/lexula.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/2664140575.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d304228437---65347106955.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3isl8ogadidln8qupkk2njjjlv/legoxotosowunozokotuga.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/2818394211.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/67db68e68671e65d3384781c8bb38ea0/65561998514.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a609857034---godidu.pdfIn PDF document text
    • http://promador.pl/userfiles/file/dakorogejojewudiwokaxijem.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/pipadinifotumozedivudar.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/welupusarit.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///13618320679.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6012d8662c---9990451108.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde2fe71ac8---68214175540.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/16675983854.pdfIn PDF document text
    • https://appfacile.it/file/19194740842.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/52d1c5da9635e8025ab7febb14c9a405/xozesubuwapidotofiz.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba6613657---rapofofopamabidabomo.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/73197546276.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/79164396227.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/45873747596.pdfIn PDF document text
    • http://zerosquareonline.com/file/duwit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=when+to+upgrade+th7+to+th8PDF link annotation
    • 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_off0001163c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163C 10716 bytes
SHA-256: 896c2377d741e7ee4ae06b0f4f715b15904013bbcb4e447527b7fb97518c6f87
font_01_sfnt_off00012ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 17664 bytes
SHA-256: 0fdea5ac31cb0dfd6b44b63c87ca85d4c9f845c825753f2ff646cfda85d5e7bf
font_02_sfnt_off00015d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1