Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d0ef0db5a85bb8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 22:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78b76365c4ff58b14f603ffe8ab65e8a SHA-1: 7ea03ada08a4881772fe9d33b8895b32ea978e13 SHA-256: 93d0ef0db5a85bb8945e958d96f362641eec61892d5c15a715827e57b80e6b01
156 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests the use of compromised WordPress sites. While no scripts were explicitly extracted, the nature of the URLs and the detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://medvor.ru/uplcv?utm_term=show+time+picker+dialog+android PDF link annotation
    • http://www.dereformasenalicante.com/archivos/files/fotixugusomalas.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zopuwagivixera.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/19362933927.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef24344e0---rudeditamutor.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/41979115349.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/xofugutomukonawapafigoxad.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/janowizaforij.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/mawodabitamofexelodoname.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/didopenezolijuzurigujuju.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fedajapepisazu.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/wejane.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/33452953163.pdfIn PDF document text
    • http://szm.hu/userfiles/file/wekotelusonebodixatode.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/e362es5e2dioktghlpsc4u9ci5/kitomitanubafovepos.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613448ec228b8---zunuvipize.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/mevizuzuninilen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6d89b222---dorosexulogurujer.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/javogusukowig.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/22509667710.pdfIn PDF document text
    • http://innova-perila.ru/upload/files/28268606808.pdfIn PDF document text
    • http://intertravel.hu/_user/file/lidabus.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_off0000cb09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17812 bytes
SHA-256: d2158e549541782d7895d8b48a7cf6019e0a34fc29572402cb30df70d9f5695a
font_02_sfnt_off000111c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 11044 bytes
SHA-256: 9ea8814fb57237b91fe58efb92d706455ade01dc3c2cb05c86eb5765a0b1d380

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