Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f0f30cb2d0267c…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 23:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bdc7e3a7dcfe651898a5fa21e7457071 SHA-1: 9284c1212e5cf35455cee651d6efb97284b323b6 SHA-256: a0f0f30cb2d0267c6e2818ee1212f9a6be646c0f05d02be988be3eaf94a1a7fe
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs, despite some being marked benign, are part of a larger pattern of redirecting users to potentially harmful content, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bed5996e6eb---92745429285.pdf
    • http://slsnn.ru/content/file/bejeginotozi.pdf
    • https://nikosdimos.gr/userfiles/file/25149331652.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13ed4c167a---zitijotisulunozu.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa21ba991---wivupeb.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b83e9d5fc---selejuganerobos.pdf
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/56038284241.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/75f1e4aa939bf571c1824db2e6bcae31/miburulaxesu.pdf
    • https://asiarsolutions.com/userfiles/file/nuvasajorubivivobufi.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160833c58077e6---69233118493.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e05d5800---demerabujuzum.pdf
    • http://inistor.com/ufiles/files/54195257362.pdf
    • https://soechi.id/userfiles/file/komunigomasodifimebotanek.pdf
    • http://gramercy-grand.ru/files/file/50782608118.pdf
    • http://irinaburmistrova.ru/files/38912049770.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/b8pmois80m6sq54ddc962unhc4/67186797639.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c5df316d15d284800786cd24aea7fa37/96269320440.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e54e66b469---56160388701.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/88558578330.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/egvq27cth2ko3gmhpgp4pmjjbg/84275022763.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608584ef2ef85---95982512148.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/58440582504.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/58534358210.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=the+difference+between+acceleration+and+velocity
    • 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_off0000f57d.bin
89624deccc23b62b1538611c52470c88c7b44d2e8015e738c81c0dd42a15bf8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 17256 bytes
font_01_sfnt_off000122d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 16792 bytes
font_02_sfnt_off00013aef.bin
9432c642704567c766f5d86c0da650cbc949b66f8b28d6718a3ad52fb9b61991
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AEF 10772 bytes