Malicious PDF — malware analysis report

Static analysis result for SHA-256 705c0d6f7dc56861…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 23:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b69ad68b8d8681fe6a8fe551b33d6c7 SHA-1: 807037918f3498b51847e9d49337716e8afb6e45 SHA-256: 705c0d6f7dc56861ab255412164a14c6b14e51c22488c999763f750b59c59a36
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://medvor.ru/uplcv?utm_term=hak+asasi+manusia+dalam+pancasila+pdf
    • http://tribo.kz/userfiles/File/ropasozab.pdf
    • http://baloneacessorios.com/_upload/file///99443176064.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3d5f117d410fcc6f7242b21bf0e53538/85077578195.pdf
    • http://cn-junsheng.com/upload/file///20216287998579.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07b8c2879---xusovujozopamevixakited.pdf
    • http://kibbkw.com/uploads/file/keriledo.pdf
    • https://torgradio.ru/new/files/file/tegerepanuxel.pdf
    • http://stainless-faucet.com/uploads/htmlupload/files/paxezusewodatadewitenu.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607bd02e8273b---16033936397.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831d403b737---17245445473.pdf
    • http://rivucota.com/upload/files/nutaxan.pdf
    • http://hnkingdee.cn/Files/file/202152422349.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/97314664080.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/35339922175.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a43fcfe8fd4---tifonozenojateroju.pdf
    • http://arabstina.com/ckfinder/userfiles/files/58104640291.pdf
    • http://asupuro.com/user_data/image//file/voxivefiwilukigajuxifito.pdf
    • http://ventilatoryzlin.cz/images/file/jagetosoza.pdf
    • http://omonetach.pl/foto/ilustracje/file/disufuweworapanusowogenew.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/7df11b1ccb018f8b2196195a5ca06d0e/38312586001.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/28130100358.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/0kssvau01k45b309cs94mc5ve6/firepal.pdf
    • http://marinapogon.pl/upload/file/xevubukuvowepozolis.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d061457831---pomero.pdf
    • http://kstarsmall.net/userfiles/file///30064336091.pdf
    • http://jainfarms.com/uploads/27139171975.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_off0000deaf.bin
5c5df96c045a189e65d5c684e9e12fd7c47f2361b5da79150553e4585ee33b78
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAF 10512 bytes
font_01_sfnt_off0000f678.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16792 bytes
font_02_sfnt_off00010e8a.bin
86128113905b1acd70ded4798a7b46244f8ebf027ccf3f9ab27132cf1f018369
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8A 16596 bytes