Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b65a6aed04b1f8f…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a37b7429ad838c403110702c4365edf5 SHA-1: af1be4c5732f31200bea1272d414338b95064af5 SHA-256: 8b65a6aed04b1f8f5fce5dc9615d5bd985cce1c02bf74eef0659fd2c15e9ff11
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many URLs hosted on potentially compromised or disposable domains. The presence of external URIs and link farms suggests the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=acmarket+for+pc PDF link annotation
    • http://gasthaus-steinkirchen.de/img/editor/file/71498174360.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/fumajajapen.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/77505154048.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/75108397574.pdfIn PDF document text
    • https://rajakedua.com/contents/files/milufuvedikibovudib.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/50889486183.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/8c2a9fdddafc1a6795249aa9a6edc075/375263562.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/8982646391.pdfIn PDF document text
    • http://gibisch.com/files/files/17542625016.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/28477113980.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7646101905a74fe41bac3cc14afef0c5/16140959931.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/460fc6952dba6ad9d56cf206587e1961/bosurejubesupokuf.pdfIn PDF document text
    • https://bolahijau.com/contents/files/lisoxadibilosakawafug.pdfIn PDF document text
    • http://techmechengineers.com/uploads/56768859653.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/jatumonu.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/25705308819.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8c309336---gifewit.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614eec1845b8a---83671104901.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83107851401.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/gowobibozas.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_off0000ac1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC1D 16140 bytes
SHA-256: 61d7ec82f8f88c63561bece0c26a8ce1a7c230fc96fe4b1cf4710f53fc49f1fd
font_01_sfnt_off0000d52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52E 10304 bytes
SHA-256: f7dadb8ba8e17152c8b165e812bbd07730bd7ae9a9ed8bf9c3276492ed4ded5f
font_02_sfnt_off0000ec82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1