Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d7f72f2872abc61…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 21:51:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7c39452a62880cb094518bd5c90911a SHA-1: dbbad8cb323560e58793482bbea47b5aaa6b9430 SHA-256: 2d7f72f2872abc61e3ade933b4fd552df1873d68ac4e4bf7f77d8424afcb32a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070f4dad8ab6---sivot.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c32b568c9---falogevinefewud.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1c77436d4---61099109566.pdf
    • http://cyuanmei.com/userfiles/file/nuwafu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e16ba26550---99558238892.pdf
    • https://mamo-tato.ro/userfiles/file/63206317074.pdf
    • http://bioident.pl/photos_fck/file/82952498454.pdf
    • https://noddy.nu/images/file/rogaj.pdf
    • http://cornucopiafrederick.com/uploads/files/80434808936.pdf
    • https://classconnbio.com/img-jacson/files/pamizakulabag.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a64f0a0637adb0c5449c31d7df0c8989/28397177602.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1abd49c81f714841b1b2a6d29721d528/wisonape.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0c4b48fa---6570456769.pdf
    • http://tbm-mova.by/images_from_html_editor/file/jivifa.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/pozabixojazavamoraxukufaw.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ede6ec6526---dedij.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896e2f91569---25267983149.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/qb7pm9lr72g1at95r8ako4ki6t/siridofol.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/572edc3b582f313e4069dd2824e359c0/70770696143.pdf
    • http://computerdoki.hu/user/file/57126775758.pdf
    • http://asijskepotraviny.cz/files/file/dosuweka.pdf
    • http://amdind.com/userfiles/file/21089559785.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3ckpn99nfgkujof6ltsgsjrje4/murepijobowigeg.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=i+am+making+a+way+in+the+wilderness
    • 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_off0000fc26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 16792 bytes
font_01_sfnt_off00011438.bin
6ec09f35264a663b574ebde5717f2aaa78a08f543b9766389e90a673a7f87163
pdf-font-stream PDF embedded font (sfnt) at offset 0x11438 16824 bytes
font_02_sfnt_off0001400e.bin
9c15db33018d9f3303bfe92483091ad612e05dfda67536a0358d4369dbcc76fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1400E 10820 bytes