Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6be0bd54a33e16e…

MALICIOUS

PDF

88.8 KB Created: 2021-09-07 11:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bdcac76735d0b0fce71e5c6a1974437d SHA-1: ea962759bbe5af11b7b4efa0012d69f59a907894 SHA-256: b6be0bd54a33e16ed9508b7186623d18338f6a06d4b057406b5517a45d797c20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://synerhu.ru/uplcv?utm_term=ecuador+visa+application+form+pdf PDF link annotation
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/47890502181.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/007451ae62bd934b7d6f49bf515a8200/lezufunoba.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210610132553_rygbmm.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5406daf07b---14447845687.pdfIn PDF document text
    • http://weymouthhighschool1960.com/clients/9/96/9679770cb43d952edac6f872f7aef95c/File/77565428213.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d178a89e9d---33382034230.pdfIn PDF document text
    • http://willbramephotography.com/64794106726.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/49705338924.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a52223d4ade---vujuzulegizikedidovu.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/dd5c43b347dcca5dde8a91f19773a5c4/99234624566.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94542886b---42802660559.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/zibijek.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20217412701742.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609365ce17c94---26629539334.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/sjk2ki7e7uk5j5vqvn2vgjnuq1/17086621951.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/72565274948.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/e9qt47d67i04be8196bbfrugqo/16493254059.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cab37901c---50387611086.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/h171emlbq0insjm0lnh7odo729/69685411117.pdfIn PDF document text
    • https://blogsma.com/files/pukotivobekipagexaf.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/88647391766.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/83497581165.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://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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10800 bytes
SHA-256: 2856baa7a5602664ee8d651d401e41672f8f90f67a6e25aa3f6e18cae1fb2dfe
font_01_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 18300 bytes
SHA-256: afebd97c3a82e88131ad9a55eaf98ca9769ed5617232f8b4402dbd93d705e019
font_02_sfnt_off00014066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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