Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f18d030358a434…

MALICIOUS

PDF

101.8 KB Created: 2021-09-12 16:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98f31b32bc2ab6c9dfdcc0c38cbb6611 SHA-1: 36907482e2a9ebc8de2d87f6c807bfde69e62ba6 SHA-256: 04f18d030358a43402b48ed7a98c2def5b85765bd7b88f84cb2b0caba64c7dda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing/trojan PDF. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which are identified as potentially compromised CMS uploads. The presence of external URIs and link farm heuristics strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.q-jin.ne.jp/ckfinder/userfiles/files/21886718686.pdf
    • https://araprinter.com/ckfinder/userfiles/files/lerem.pdf
    • http://zaun-produzent.de/userfiles/file/runejibefawapetogegamim.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/pufalotezi.pdf
    • http://studiomarcheluzzo.it/userfiles/files/roselotaj.pdf
    • http://www.smpnuenen.nl/images/files/sabupa.pdf
    • https://fleuriste79.fr/ckfinder/userfiles/files/82015385013.pdf
    • https://corpusbg.com/files/fck/file/78201633182.pdf
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/26183532760.pdf
    • http://newbiesites.com/userfiles/file/80166660178.pdf
    • http://bakoca.hu/files/file/xudapuzobotoziwi.pdf
    • https://mtmnetwork.net/uploadEditor/files/netodikib.pdf
    • http://dolphinkorea.com/files/files/gevodidelufewaza.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bc8b6a1c3e5406daddc9b904cbf9dfbb/80071348708.pdf
    • http://kprmk.pl/userfiles/file/7427164675.pdf
    • http://ahkjt.com/upfile/file/lawoxarij.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/nizavututamilozinotetis.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/b3c35f1bdc1fcbcc56a58965a03ceef1/42782590269.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/wamivademini.pdf
    • http://cascad-trans.ru/files/23802491734.pdf
    • http://artospace.com/pics/file/39304207159.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/f6db3c4b3bdf03287bf3edf1adfd0272/30516602358.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=telegram+x+2020
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120B9 16792 bytes
font_01_sfnt_off000138cb.bin
e9d5899ac526e38b0394987b9e9d90379f3f8dc140012211f279c717fcdf9b72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 22136 bytes
font_02_sfnt_off000172cf.bin
982c643b7ac67ac9697eda15da22a36f1313fdd3591b9c686e7a276094b70f88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172CF 10176 bytes

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