Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe1da34916e0bc2…

MALICIOUS

PDF

91.9 KB Created: 2021-07-22 12:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7561888172d95914d3d6e29d6089f464 SHA-1: 03528aec0d802f44e5f840059898573694f5410d SHA-256: 3fe1da34916e0bc212c4e459dfb54143958295c29ad9a6519e543982f0fdcec8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary goal seems to be to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cropscipublisher.com/files/upfiles/file/63678108712.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607152140f343---lolef.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db56653c5a---fikegezoj.pdf
    • http://nationalcoopadvisors.com/userfiles/files/digirer.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f300520e0a---99294606459.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dad44774---45315680131.pdf
    • http://apexibd.com/uploads/fck_uploads/file/54169145789.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/74m1mf4ltmou3qr488pvedvv6g/31902935637.pdf
    • http://blackhorsesc.pl/userfiles/file/jesenimetolopudab.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aab3333f3b9---23995710081.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/g8ro4tdfgar0o4i1p5edvfrre0/rigabuwit.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adaa8cd1830---60519206417.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca7da68e38---43572665096.pdf
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5b39fcf4e840ecb9b0a149247c798686/tubofupukobuv.pdf
    • https://hometeamcorp.com/images/usr/xonenesimikelikoza.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a6d92fb---10293549493.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/37431571107.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d5c748e25---kukupesadepamatafomofupa.pdf
    • http://rund.cz/UserFiles/File/44402488499.pdf
    • https://aronabritcan.com/userfiles/file/vagedikowig.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/573ce77e1be3e8574a2352761dc5d72a/95925444506.pdf
    • https://zionapostolicministries.org/uploads/file/39824950655.pdf
    • http://gistys.com/userfiles/file/jesonikimajisevuwomirox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=planting+potatoes+in+straw+bales
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104DD 16792 bytes
font_01_sfnt_off00011cf4.bin
0f18f2f19271b62832b49989c66ec3a867190ec566bdbb82fed16ffc6f8d5deb
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF4 10656 bytes
font_02_sfnt_off00013552.bin
5ef7814723e82c25e4a3b84144cbbb28faa8a06b7df2db5d15e26513816a8ed9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13552 17092 bytes