Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d723e2c52fbdad…

MALICIOUS

PDF

86.1 KB Created: 2021-07-16 09:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0b1e58b50de067c5aba8f45238f8968b SHA-1: 48cb5987eb802fd18ff8b54315106049bbdd90d7 SHA-256: 08d723e2c52fbdad66c190394def2e8c9d095fd3e7993acd7ef40e0104f0fb3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://pistant.ru/uplcv?utm_term=insignia+ns+40d420na16+review PDF link annotation
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/16f2f9e3070a6b5de233a7de3604d829/50707417360.pdfIn PDF document text
    • http://immopolignano.lu/images/maxofezivowekoxiduligosa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc055055b---54253035955.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/sijuxagoj.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e4cf86d76---todubaxulubax.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nusarizupijav.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/2827a1bd4bbde2f746d2826c8b183fe2/19702652393.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c475f0ee88f---60006871968.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xazutatupoduzivegotivuw.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/c0sqm8v5bpdtb0ctcr48vmiehn/xovidemini.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/23931040682.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/gifukofaj.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b6ffc7db01985d7db4f4c4493adcec40/896168005.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607745dd54964---67468671949.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/66321260623.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bac9ea2ca04---tegawuwigove.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/leoa2nnomnmcl4405ndg9foqm4/85747578556.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f81a950aad---95340541638.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9be58bcf6---bonaredutaserobiz.pdfIn PDF document text
    • https://pmms-online.com/assets/file/19290461960.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/72bf3f59f258a2f3054cbca08ba3a64a/jakikodemakosugujob.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/kabezefojekataxo.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://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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB3 17724 bytes
SHA-256: 2a8adf4a716c9bf7d181d7db753357ff7787db84d6f39e6d369e30bb6e55a13d
font_01_sfnt_off00011a76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A76 10804 bytes
SHA-256: 40ceffc4fd7430cf8be3d24b796d96cab6fb937f7e492d0bb003c9ebbf511777
font_02_sfnt_off0001337e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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