Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7f391c8466aced…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 02:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0a01992ca0e773a39a80654b70fb903f SHA-1: fcbe1fbc844e76899a45d6b9d8e176af5f03e306 SHA-256: 8c7f391c8466acedfc3bb4d79ee369f9b26f9d38f43a20a5dc1e739eb914d461
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains numerous links pointing to compromised WordPress upload directories and other disposable domains, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious content or phishing sites, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=understanding+and+using+english+grammar+with+myenglishlab+%285th+edition%29+pdf PDF link annotation
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16f28ce278---vugojepalupixisesepuje.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/82859404050.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/viwujufi.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/95593746107.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/fumedazosinebogofipe.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/cacc798510c3367949ea3ea9b5a05963/jobefijuzokujumuzed.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/96550396334.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/88257630518.pdfIn PDF document text
    • https://egca.fr/userfiles/file/85082079366.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/nilokoposanidaveve.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/dofugiwoli.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/musokizoretusivek.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820138342f6---58934912626.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/rimejefopifevamezuf.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k3uq0ml2eejigvfv43qpn2opfc/2483900798.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c5c675e9389f5a74a8c689bfcc42ea38/vapasoto.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098e96947714---43074292939.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/takiviwuvikuzeset.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eeae614659---56468532236.pdfIn PDF document text
    • https://waroproject.com/file/guroginabibisasamolorasu.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/wixuxibikekupixi.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/jixanofivowanurebe.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/dexefodifinitosug.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/985be670a94f105d48a549516b61b854/dudutovivilagetezak.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/59495300272.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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 11680 bytes
SHA-256: af99b6c3aebd280058dbcbcb539794995b9537cf57aea4bc1e3a8f1df906314c
font_01_sfnt_off0000f5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 18012 bytes
SHA-256: 28fbb0652dadc4349d46213b0528fc88e59055abde91bc4ce744d9bbee460640

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