Malicious PDF — malware analysis report

Static analysis result for SHA-256 76af2f184f76cdb8…

MALICIOUS

PDF

78.6 KB Created: 2021-09-04 04:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 92efec1ea5356b57d900506ddb999228 SHA-1: 279924307379b1c6a6bf6e3d6acc9849a1817b82 SHA-256: 76af2f184f76cdb8347149fecf9280f38a26fc8e938df7afd831ab7f342b40dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being part of a link farm, with external URIs leading to compromised WordPress sites and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=concilio+vaticano+ii+pdf+resumen PDF link annotation
    • https://eghamatkade.com/basefile/eghamatkadecom/files/dazefilazafumonaxigazon.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16080c40ee2698---buvijazu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0276f8e350a5f9e4c3bd924a318f936c/mebozomusut.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/lutabutamajizukufov.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4a6f2668164c193c72b03cec92011279/mewovaf.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a62bd1ac2---10863556787.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/27067593736.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7f58f4d5---zoxelokaxuk.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/dexopisam.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/65377826093.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/sagorumeludavigitosik.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2e1146ef98613f7ca15589977e58e7ad/togepagakajovalew.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/buwofo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/gtmvs7geagf34rkujsb9obsd7l/kogowuxuzavorojatubu.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a483f89191d---41434547798.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/bogoxabumet.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e393b736d---8584192047.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608693b5bcc87---tonifigisivofavan.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/gojexomuwevalinufuzim.pdfIn PDF document text
    • http://c-six.it/userfiles/files/furoliji.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/17544912201.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/21414416706.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/petefagirulexu.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1aee633ebb2380fcbf363369622e7009/punut.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_off0000c89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89D 10976 bytes
SHA-256: 029b0bf8f8e093e96a7d1ce9b5c8c385a471de03284b6043c6478d7a51c86469
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 18716 bytes
SHA-256: 3f7a73527844514ec6dc56b74c508a987d01154a2070360920cfcf812487b031

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