Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c515116ce400a53…

MALICIOUS

PDF

84.2 KB Created: 2021-09-01 07:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90198e21da413dfed3135e76d214e9fc SHA-1: 4aabd6998ab5c5d2e8c5d93aa130d90e0da04619 SHA-256: 3c515116ce400a53e9514ed45fdfe79185f6d737c794e5135408f98989d8c803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to lure users to potentially malicious sites. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vector.

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://queure.ru/uplcv?utm_term=transaction+codes+in+sap+fico+pdf PDF link annotation
    • http://metisentry.net/ckfinder/userfiles/files/panewanagub.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/surevij.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/93716735357.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/buziguvikep.pdfIn PDF document text
    • http://szhlfz.net/upload/dufugowutu.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/xidalasogi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22ce3878c6---kefuxowop.pdfIn PDF document text
    • http://broadmoor80.com/clients/866172/File/bozizavodenabunukavab.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/zigobopugufozodanafe.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/74005921772.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adafdb841ec---23925906303.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/53866581589.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/sumegojugonolipisunefu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8cf2c868---34701849325.pdfIn PDF document text
    • http://piau-po21inn.com/CKEdit/upload/files/41207329691.pdfIn PDF document text
    • http://15881588.com/ckupload/files/denoj.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6169e1dc4fb5712e6712a36dc8ef445/65499133559.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d40fd224b---gafowusenivutositixo.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609e42f51baa4---30519470628.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/kuselubisez.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16127b3098c208---6697104926.pdfIn PDF document text
    • http://findusafranchise.com/files/files/25060818516.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 10528 bytes
SHA-256: 58099f152915e5642601749135fd6978b79814381af740870522d834a632f9bc
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 17992 bytes
SHA-256: 53713ead8e0dc7f385933a6f043af5d2e5f4006b80dc34f5a8e5aeb6b371ddda
font_02_sfnt_off00012bae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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