Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6796656a42f4ba0…

MALICIOUS

PDF

97.1 KB Created: 2021-08-06 16:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9138f7f381c3f33aff2625d7aff1417c SHA-1: 2c721a16d90d23e53b66686ddb14b55102af4cb0 SHA-256: a6796656a42f4ba029904a8182894103dead4ca55b9e8a7e874bd918743d56bb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms on potentially disposable hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8e46f16e---xirikisitarogosawefesuva.pdf In PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f170936370---winifozuja.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/2a833b7dbb4117bfea2c130a86b481fd/rarelen.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160931af0b982e---zulurojes.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/49235663331.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160707127e154e---55085830466.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f1b65d184---fedumiletuz.pdfIn PDF document text
    • https://andrejc.si/files/file/xatebisokotepuzo.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/vizitunevevez.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3bdbd1d8d---lezas.pdfIn PDF document text
    • http://klpa.net/userData/board/file/finaribimapiludosen.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/6900563153.pdfIn PDF document text
    • http://alkanboya.com/files/file///42724502343.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/wivabonalemulodi.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/vezod.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/93917969734.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916555c820d---bipewi.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/3290587568.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/biwefenob.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fea760837c---labepop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/frnsr7rr6mdpth3jdscni9nmjc/52768522323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=what+do+you+mean+initial+velocity+and+final+velocityPDF 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_off000116f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F6 17452 bytes
SHA-256: d7a6a9cf9dbfab0bccd4e536d6ad1cf035ecd738b430227284b44ba0af557d32
font_01_sfnt_off0001452d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1452D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D44 10748 bytes
SHA-256: f2e0cea5cf46a643e07ffd05257644994228f04bfae001e8f6de22661fb9453a

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