Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac36e46d8e5a1b5…

MALICIOUS

PDF

96.1 KB Created: 2021-06-27 01:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f604a34fae588cae3caa6034ff85f14e SHA-1: 7a1478f4d1b189435b4b2885d0761dd019d5084c SHA-256: 4ac36e46d8e5a1b5164ecdaf5814dc4536a27b17c25c98e88647ec63de2a0947
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, indicating a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=abstraction+in+literature
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891635daac3---56361986628.pdf
    • http://t-eamplus.de/web/editor/files/15072801833.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609453df27134---82193742013.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607015ca5d16d---napexozamesasuduvasojeg.pdf
    • http://op-gold.com/ck_image//files/tepalasome.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608476b7ed724---gevivoxo.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/crl9itt4cqbe7h1jbenaaucl0q/sokubulogosiwe.pdf
    • http://rockpapersun.com/upload_mce_image/file/manewuvotolasogewevik.pdf
    • http://collegium-connect.nl/ckupload/files/ponibinuvutijuwi.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b2abbc33733ecfacf1b95699bca4b57c/51539710515.pdf
    • http://china-baby-clothes.com/d/files/58204423836.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/74d204c2278d1ba0cd63bdf8cbb189b6/xamepijumekofifaz.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c763de9c4---mijadojefuguxa.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/aa8q92arms9g612ubkbh89sjh7/wuvesu.pdf
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8b503e1a6---walisalixumutuviveriv.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/munm1dpa9m40eueq8c9id52075/79530994170.pdf
    • http://watthaistuttgart.de/userfiles/file/64981846557.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/a57471476865081440408de3bc6068bd/puludarenivej.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072feaa0ca63---82154062106.pdf
    • https://triptoboloyfoundation.org/editorsfiles/files/wufezujajo.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/951b24a2499af27ab33e6f43bc4cb2ed/37074219711.pdf
    • 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_off00011384.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11384 16792 bytes
font_01_sfnt_off00012b9b.bin
f77b023cbe0d803b257708a9483760b7d3beaf4b8a9d6f580b4b41f487534173
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9B 10444 bytes
font_02_sfnt_off00014379.bin
d097984874f91ba1dae072fdd4913cd1a5efe2a3588f0fc94cb93df990a6353e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14379 18076 bytes