Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9fc8614479cbe74…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 09:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e554c6fb323a0da0b66f4b477a81667a SHA-1: cf819800181b0a88bcc34d5e112025256737910c SHA-256: c9fc8614479cbe74360cd8c092de2e78be3817035456c9f8b30b631e71281371
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious websites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://rowanmkt.com/Uploads/ckfinder/userfiles/files/22272828421.pdf In PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/tokopikaresuxav.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/37903598174.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/gilesifizipa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/540a3e6c82645e77cafc071552be5c34/50333974112.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/judokif.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/llbesmdr46h9maijs6belr7tt7/72473698789.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8859f69bb6---lukakepavanuro.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/98982697185.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fc364cbaa657a3fde885dc8aba4f0f6a/wilafofexikixuku.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/86427278078.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/c547cd5e587c181b3a057ffa9361951c/warakojuk.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a83f715799---zokererewisixez.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/gosuvariviwan.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202108190445327723.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/74931881437.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/1mllfr50a70hn9t7cobathlagr/tevijodogotud.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f135ea0133---98230517694.pdfIn PDF document text
    • https://podimercrm.com/img/files/70888935099.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/miwaladofojurun.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/t442e7pktqa8pmvgkn0rf48eth/73499647179.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/xemiwagixoganikofixatile.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/81732401689.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/13994599755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=preaching+and+teaching+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 18544 bytes
SHA-256: 6a7a3ec6286eccf8a2c661c3eaa3adcdeb61c2ffcfd3a9511f8a5cae98c6340c
font_02_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 10564 bytes
SHA-256: 027c1771af8ebc7d808819098aea9ebd02f0290d1a93de4bda8fb6fe7a462d3b