Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf6a90a86741654…

MALICIOUS

PDF

76.5 KB Created: 2021-06-30 00:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51bd6c860caa19a6bb703a6a0ffeec3f SHA-1: d618a84c69b5641efe76e7b00404bb14b53b2acd SHA-256: 1bf6a90a86741654ac24eabbef7a8ca5793479a8d2051be908914e6f570410f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab79b52bd98---57366659179.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8ed7c215---kuxorebokuroz.pdf
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/81481454828.pdf
    • http://blesk-stroy.ru/userfiles/files/57837112502.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608535e08257a---guwezujuraketopav.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a293a0df78---fopoxiruluboxatapijek.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/7cba0ba2c95c2854227cc436d2a82e20/jafalufifemaluwonux.pdf
    • http://wenxuezj.com/images/File/32785770539.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ovcdqcq5pfeahj594klm4ip908/ginefukoki.pdf
    • http://hysansam.com/fckeditor/userfiles/image/60807893803.pdf
    • https://tcremich.lu/files/files/lerinawosipepab.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f5f6ce2a---dijujo.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094227fe72b1---fukejoverogodobu.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5e1c70c6---fuzuf.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b5568d8d6b3---51193264930.pdf
    • https://securityguardsupply.org/php/uploads/file/25275973602.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/e2e5e4f9f196d582fc515fa4aeb419b9/53656759081.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c15b2bffb7c0c9534307d8c4ce4b0b0e/sajejefovez.pdf
    • http://derma-dts.de/files/file/vanazoxekaw.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077004d1d874---nularugovonijesebefer.pdf
    • http://scro.ru/pic/file/40064850106.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=i+love+now+and+forever
    • 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_off0000c263.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC263 16792 bytes
font_01_sfnt_off0000da7a.bin
cb086837aaed5bb0425fc91e0a1c44f1b5da9bdbe50de4e2ac6242ae04916c0e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7A 10092 bytes
font_02_sfnt_off0000f11d.bin
d98a8fdf4b08fe177b3f7be54578b59ac3d1cd564599eb2e21b37e4f4d206fe9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 21676 bytes