Malicious PDF — malware analysis report

Static analysis result for SHA-256 c513539c6476ee2e…

MALICIOUS

PDF

87.6 KB Created: 2021-06-25 17:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 575178c85bbcbd372b0b7b3136f9d66e SHA-1: 511040db15a7ac7848ce77fb78c3233a24335050 SHA-256: c513539c6476ee2eb99722d11e26d69d539368d70acee9b6703dfe1dbbe594d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of an IP literal in one URI further indicates a potential attempt to bypass domain-based filtering. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns are indicative of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/js0a6ek2qb1heb9jfjuaa0a009/kofidewulozeganipexoxi.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/ab9caa7fff5e10c6966c75f0b4eceb16/rurudiperoxewojizopu.pdf
    • http://iuf.kr/pds_down/files/52579432232.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3ddd4668---kubugor.pdf
    • https://hondamienbac.vn/userfiles/file/71442791340.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b9392ac4d4123d2ce93fb5bd5ca8215c/36162729899.pdf
    • http://ciskmv.com/css/file/32862699111.pdf
    • https://binarbaidrealestate.com/public_html/userfiles/file/kazuzukupi.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/317216aa17b9eb560777920fc6692631/zowiwovofarurotuge.pdf
    • http://novichiha.ru/pic/file/32985350472.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074584eab97e---vapafeb.pdf
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16076ed38395a6---6482535701.pdf
    • http://seamcc.com/UserFiles/files/vuxazivafofe.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6kp7tg315j0ggflf2u11nogp/71180814601.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4980bf6e---mupisinol.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b644eabeb---xirefa.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ade2f44d666---zadixogoxezedubujodebu.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad7a7664d4---87502401277.pdf
    • https://termoformat.md/img/files/bojesisojikizewogumekopo.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcedbe1b27---toxokakoxatugapaluzug.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/c83688150ad06f8701c4d3c77440fc70/malaxanav.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7fa3f2d56---tosuzubamasipovufasepe.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/80766116539.pdf
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021061120020680554.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a88494490c3cec84bb29a02152f62241/ganumonikurifuzu.pdf
    • https://sealordhotels.com/ckfinder/userfiles/files/bigipumefimefej.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=frozen+color+by+number
    • 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_off0000f15b.bin
6fc5d896369b1d857a86c1bb35537e02c255a1bd090644078a6ac845ddba60db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 17840 bytes
font_01_sfnt_off00012052.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12052 16792 bytes
font_02_sfnt_off00013869.bin
d69976ede9c88f5708359cfd12737063530405838b963b842b89782761494878
pdf-font-stream PDF embedded font (sfnt) at offset 0x13869 10264 bytes