Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e36c1ed21c8b462…

MALICIOUS

PDF

87.6 KB Created: 2021-07-15 12:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a507fd1a26c7583157b31c39c9d0c389 SHA-1: dc8b3cc4b51ae3aa227f167f02e28a5c38b3dd1f SHA-256: 7e36c1ed21c8b4625cb139608baaf6e32442884d1934736fd410dc2fd3a405ef
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The presence of numerous links on potentially compromised hosting suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e2c8fcd4c06cfc92e39543e0f2c2b558/199653673.pdf In PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/f90u6ocgk7vtcc1fic38g7op37/gemik.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1932999bf7---fedikomu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16089595ecd62f---pegijixobafokaviwaxosu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0bke2gb6v8p7523kef4an5hun7/83243115435.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075be5d040bb---12853277409.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rimmo1a2c0pj4l1bppk9rjiet8/sebugifopuxofegobuja.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5e78fc4bc1ab32ddf64bc0921de33fae/rajojenejepokazutedo.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/aad94eface9681c7b1085d7235e7dcff/jokexutizuvedizirexosewev.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mgjm1nmmvd7n26kf7qe12vmei6/80258129549.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/43895874076.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ajan9bohrn492rdlphqs0vcht2/zoxinitikedi.pdfIn PDF document text
    • https://banghenails.com/upload/file/79495456386.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/93042572486.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88c9d6e28---21843173938.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070df26001b9---21405262331.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2e831bee9b872cd6ca7edef591245e4d/wonubonovada.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7dff3598f---jamobujobapasopepuzax.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/susipa.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/xanafami.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/pidewila.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/23iqcupsg0bl63pnemeisfncm3/kolegeluxogupotagukamu.pdfIn PDF document text
    • http://cabin4kids.org/clients/0/05/050cd0fff5f75fdfd14851583cc0de74/File/jetemaxefasojutujebewi.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/68673475349.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f1b1e4b61bca1628b056de7630f55a67/89069850740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=annotate+in+powerpointPDF 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_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 17212 bytes
SHA-256: 5e2d18099ceee365b3a0987afb236ebcacf08ca003e3c2ef4b4bd04ba0e08d20
font_01_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 10100 bytes
SHA-256: c5ec35359fa53e304b1cb98de16100a953f153cb2e557773597e5ab09bea2b42
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1