Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea83a2d1000ce53e…

MALICIOUS

PDF

71.7 KB Created: 2021-09-04 17:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2541a69b4e8a98c18448325f81ee8ffa SHA-1: 9b069e2474bccd6ab774ce739fc3df4e7c053437 SHA-256: ea83a2d1000ce53edfd6af50a31d149159d0c2956f7d1b699a501e9d7a035860
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification further support its malicious nature. The primary attack pattern observed is the use of a link farm to lure users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5522

Heuristics 5

  • 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
  • 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://jjkxmy.com/upload/files/202107200112098862.pdf In PDF document text
    • http://divorcefinance.nl/uploads//file/tomuzosowozilakesumebopo.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/kuzifasubomak.pdfIn PDF document text
    • http://jucal.es/images/file/tajezaguzevigo.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/p8rc2ofqkksegf1vbov8u6dklc/puzomuvifiger.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6180077c9---gurekunalonarowajitipovu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf2602199b---61435270801.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/eg0fipaka3rijabif6up5d7fav/79064129152.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/111fbd6037469691c27b428a7aa2914b/16546037129.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a64b3996f---23200214237.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/lilalivozonug.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/20925581912.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/b66c1987b7dcbcb10952f4ed99ca195e/vexapemipatunuwimoga.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/25902471101.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/rafajorerojoferofukaze.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/nikak.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/72098074422.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210723_B3AB64F4E5EEA599.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/54981014561.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/21c622b020bb37e9ea70adb95e47c11d/92202654835.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riwepevubetosaluji.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160984f38822d8---dumomukagolufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=jacket+crown+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 10476 bytes
SHA-256: b70547fe2f8590883a86fa27677d7b4fa725798ff63ec2ea4097163b96cd49aa
font_01_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1