Malicious PDF — malware analysis report

Static analysis result for SHA-256 965d37e1912e6aaa…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 12:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619bcf6c9e2b276164f439ef0b9e7173 SHA-1: b899ceca804437345c2094597f21663860cf83df SHA-256: 965d37e1912e6aaa8a1c0122d7719c37724ef287d3722307a402b00acf1d21dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://gaushalango.com/uploaded_files/userfiles/files/72077448422.pdf
    • http://elfobchod.cz/foto/Image/file/97232768213.pdf
    • https://coonvalleycc.com/userfiles/file/labujof.pdf
    • http://panda-es.tokyo/yamituki-n/uploads/files/60058460287.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d34863a0933---83218746431.pdf
    • https://at-studio.tw/app/webroot/userfiles/files/20210702_040835.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/5r0g0dt0mn26vse95bcsujns4b/97695139649.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7ef896a4---9696726480.pdf
    • https://unaizahic.com/Files/files/pijomilefafevugivi.pdf
    • http://ingmontagna.com/userfiles/files/wadawowu.pdf
    • http://amphorabeautyclub.com/campannas/file/24197207736.pdf
    • http://chaukitchen.com/uploads/files/63630862906.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/dti2dqa4gcb1a7lrj8gkhtdkap/10313456269.pdf
    • https://icon-studios.com/userfiles/file/12213231634.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160840d9e29887---volewila.pdf
    • http://activesolutionelectric.com/images/file/mofugavowejoludep.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/76da88cdb43d842cba81caec896e45bc/57816654490.pdf
    • http://yuha.be/_files/file/gejomiposekog.pdf
    • http://livingkaneohe.com/userimages/2551943751.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/37e623cf9a84dea7cc70c89a4bcd2316/wubaxakafomivizijapirev.pdf
    • http://botosani.ro/img/uploads/file/87389183896.pdf
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevaf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=tratamiento+quirurgico+priapismo+pdf
    • 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_off0000ef2c.bin
3fbcdcc6c8490282b7c389d3845e8e7d1a7f646364208dba5a7375407dee07ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 11124 bytes
font_01_sfnt_off0001089c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1089C 16792 bytes
font_02_sfnt_off000120ae.bin
52582df64c7316b70e277ac6dcbeb347dad3ef0b241e30e62b8a84fe0823ccb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 19636 bytes