Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f689bc6747c56e6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-03 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 13b8a5a0b9836e66a4ee5739984f4efb SHA-1: 18162dc4cb0cef0a0504a2ace4d41ece5d14b4f9 SHA-256: 5f689bc6747c56e6bb6733bf414f25487d20fc5c3db7413624239f4f641e29eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=maersk+aptitude+test+pdf PDF link annotation
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/s1jmp6gq0ssi98k5vamj0j8bu5/nokusotiviparigotu.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/32993622732.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/88678379774.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/17596720292.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075d59247d3e---navilorosopekugajan.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jepuvidujofugubu.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202108/1628975853.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/jabekegenazedemu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49670848408.pdfIn PDF document text
    • https://slide-bearing.com/d/files/59669627276.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a167552c3---fewisapipudisuxogijaxesid.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1b1388c5d---sulawika.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/vosofipejobarinuja.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/81612285061.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2736542991---gaxaxote.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/ce628720466e215c2bb4f913da44e9fc/63451336838.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/18002145980.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///92289207673.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210620165633_fid2gm.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/japuwonuzema.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0on5cg9obplgbhdjkh25ole3n6/raxowefimodigularafifa.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/76484261508.pdfIn PDF document text
    • https://atavio.ru/files/file/48341267501.pdfIn PDF document text
    • 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_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 16064 bytes
SHA-256: e575765e727f0bcc5e52cebc33e68c45d2a5ac0251dd246452b04d3c4d40f12f
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 10408 bytes
SHA-256: 7b3ba1275c23f9561b164c3626a54948ef6d10a5bba940cdd69c95bc85c964d4
font_02_sfnt_off0000f555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.