Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b7bcde73cd06fa…

MALICIOUS

PDF

91.2 KB Created: 2021-09-03 08:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f5ab2278149ffa7c7e65373c9e18bf13 SHA-1: adfab7060a669dd081a995753dbe2f63204b3f45 SHA-256: 88b7bcde73cd06fa1cc61a2e1fd2e0f8b3c3a96adfe9c4833d7fe4a0e1b5524e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gkfl1sa54erckmfkqlrndt07g6/31753987993.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/20316669528.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ff04e691972edc336bc3a69dbf8b26c8/mozowezasotumigogajemod.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/weverowagevafa.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/395c05ac37034ccb6b7beda387142be3/ralotepasebemoduluxo.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/2803385735030af55a3b04474bcc0513/83111125765.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-7-20/20210720182240889175.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b52d2635a2f1b3a8ae96889e43aefb51/gazomimeli.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/baloguliwagux.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9fa3082c8---xamalep.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/89604667215.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/xamaxakoxoto.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/70456607822.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/nigoki.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/19384206245.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/jotusojisusibivux.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/3563461479.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/kobagox.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084623fe24e6---22351584681.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f992fc7f264---nozinu.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa71d1bf0b5---5427921814.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/84722062069.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/42291973257.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1590ce73bc9a2f4eb820b9d139218ea1/falegoroxa.pdfIn PDF document text
    • http://www.bandungmesin.com/file/bimuzozaxedisaxe.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/zidaxamozorijaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=discussion+method+pdfPDF link annotation
    • 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://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 16784 bytes
SHA-256: 03937160c51231f0ecacb21adf90d419060c1452afd9da2ef8a02b29c49b9eee
font_01_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16496 bytes
SHA-256: aa3595da9a77a6640e02ebf276625b418a861bc2731109bea5ef55dc2a169d92
font_02_sfnt_off00012e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1D 10680 bytes
SHA-256: eb9d0b885b1001a2254ba0e4f392680d3841d8d0240fa8ad78cf8855df50194f
font_03_sfnt_off00014669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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