Malicious PDF — malware analysis report

Static analysis result for SHA-256 3321c620a521bea7…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 05:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9af0cf153055fcc3af5fa6152e189c30 SHA-1: 6ffb03d699faab6ecb1f57ce57c0794eeca88bdb SHA-256: 3321c620a521bea7ce86ab5fe4e7ab09ffe53a11976672fae3445c4c7099465d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. The presence of multiple links, including one on a compromised CMS upload, suggests an attempt to direct users to malicious sites for phishing or malware delivery.

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 http://zaun-produzent.de/userfiles/file/76142845871.pdf In PDF document text
    • https://jin-hung.com/userfiles/file/pelufozelapavelafinin.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/ligudiwodipozim.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/fadiruwutalixe.pdfIn PDF document text
    • http://koutingchina.com/upload/files/59684631663.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/1929998414.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/49112781315.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/82696700896.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/fovozuzufewa.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/27707246607.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/74463504150.pdfIn PDF document text
    • http://gibisch.com/files/files/66029612409.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/neniboxejosisegasiga.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/7643113043.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/fenisijufeje.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613295a58784d---43010655629.pdfIn PDF document text
    • http://hejia-ele.net/upload/komapulolupiza.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/24516701611.pdfIn PDF document text
    • http://daithanhnam.com/upload/files/zomaxewivutuzit.pdfIn PDF document text
    • http://novichiha.ru/pic/file/damibadibamedinumewemiza.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/89426899841.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a13248b826be626491787190a4a9a535/tutur.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4cf9bdff---jobepezega.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/gexenasadudukofojulos.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/60903636602.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=baixar+os+melhores+jogos+para+androidPDF link annotation
    • 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_off0000ca11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 11028 bytes
SHA-256: 9a1976634b48a384c855e87f91ca761e88738f4b38a067311937b559dc3250cb
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 19048 bytes
SHA-256: 5c7d7f9d1ebb83cc55ab0294c09196ac266de6e5b5d8441bf53170b787e16d2e

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