Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3dd6a65d55a0a09…

MALICIOUS

PDF

92.8 KB Created: 2021-09-15 20:54:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe492ec9541d96bbbddb8a0431c83d37 SHA-1: 4912de9be788a68b4aa066e531b1b26bd0289437 SHA-256: a3dd6a65d55a0a093f3f3a718895d80ba64bcad3f9a37386426536bb5151268b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://imobilestore.de/userfiles/file/semaj.pdf In PDF document text
    • https://membermimpi.com/contents/files/1488642878.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/f4d86e1335ea18e1f41b5a85f28575f8/8643151598.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/611c36659e846a516c7e6e1c1441fa26/25448153490.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/doroxezesakixexixagow.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/vubumunafitigosorukokosal.pdfIn PDF document text
    • https://cape-electronics.com/media/file/bidonawototudipo.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100625504668.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/pedipisomu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tulasoxusasodapumojutaki.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/21895108593.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/89770264125.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133634a5b421---soxonojawajifu.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/23894129691.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a26fba2d91---pixowove.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/litanilonidis.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/93884834476.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/sezumevisosejudula.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/fovetalokenatugabegax.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sozasonojapivepati.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/36456414834.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/23955573699.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/tojitudofakumevuxi.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/80416840237.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/38445054852.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikirubavex.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aadb9647d9---4482104726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=best+movie+2021+full+moviePDF 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_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 10524 bytes
SHA-256: dcf069f732176349af4627a73f072c8486a6f7af8e8343c45c0fd1c4848744f7
font_01_sfnt_off00011b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 19236 bytes
SHA-256: fbb9103bfbcdaa18f9f2c5bed46a08b8ecd6ccf4b5ad5bf547a83af627fe1a5f