Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c3995290f812cb…

MALICIOUS

PDF

99.0 KB Created: 2021-06-25 13:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf6f96f21d1ece93125878df0c6c8655 SHA-1: 8c61cd8d4e85ee5ad3c853dde15cd90fec29daea SHA-256: f5c3995290f812cbaa7b5d3a38f3d9214a827ed704723563af0937571b5138e0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160795a9737e74---fesafawa.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768dda90c0b---miwagivi.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/7dcfb24e0aa71a26e62e27781fab4165/sovozekoramokej.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f346614ebc---ronij.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e22febe74c4638019a3909c10b4df10d/zipukonidagoku.pdf
    • https://deniz-sogutma.org/img/userfiles/file/bajuvap.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/laravapizulen.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6830036551b200f1fd9ca6b1b1e6fcb2/mexijesigiroxigalodawo.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cad0f132bf3---sevawavutalotiwewazakodom.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701f17062ac---45500678517.pdf
    • http://ibb-online.ru/f/file/zidejonajenotov.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4880db8b7e347e3ccb15847635e25907/73849145417.pdf
    • http://qytbearing.com/upfile/file/juronobifotibazababor.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12c4b23c7e---62644043345.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/vsm3qfgrtidlbh0srnc0kkb636/96522270094.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3216ad33---xoweniva.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=find+the+lcm+of+8+and+9
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010874.bin
f5d5c1cd9d99384116c203d867278bcb29c1d35d696503539723842cdf9f0d86
pdf-font-stream PDF embedded font (sfnt) at offset 0x10874 18172 bytes
font_01_sfnt_off00013903.bin
325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13903 16084 bytes
font_02_sfnt_off00014e30.bin
38d4265f7cf11deb8050fa825489db384cf6c9cde930024b249e1c29447ea152
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E30 10824 bytes
font_03_sfnt_off000166eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x166EB 16792 bytes