Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93ab6a6ae581751…

MALICIOUS

PDF

70.2 KB Created: 2021-09-25 23:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 18cf9abc99d945f9871f42f6677448b9 SHA-1: c8079192a1353fbd10a266e6c6656c07fbc959b3 SHA-256: a93ab6a6ae581751e743e5f7b28a1a9e6da6dd172216619c215c0fca71b015b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://crewmak.ru/uplcv?utm_term=android+application+player+for+windows+7 PDF link annotation
    • http://studiotecnicomartani.eu/userfiles/files/fukeve.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/newupigujejiwuren.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/wonodup.pdfIn PDF document text
    • http://ridendo.cz/files/file/devezotinuzoliwobiti.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/51942846237.pdfIn PDF document text
    • http://creationart.hu/files/file/54217142327.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/99729931736.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/99928971121.pdfIn PDF document text
    • http://bakoca.hu/files/file/40203795172.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/68546913842.pdfIn PDF document text
    • http://etkenkalip.com/files/rodawezidelelo.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614e3c7b74b62---jisopadikaz.pdfIn PDF document text
    • http://livestocktool.com/d/files/96572352140.pdfIn PDF document text
    • http://kme-kme.cz/files/file/67880739113.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/funet.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613534603423a---8738847463.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zobilajowezogazudaju.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/56967587124.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/2089efe863d20967c21b585ac227712e/nedafenafolenikenokanozaj.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/jewoxobunodi.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/pibazupupaxiduxuf.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/72145508461.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/24076339829.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/95044369855.pdfIn PDF document text
    • http://millenium.moscowfashion.net/content/xuploadimages/file/duweramuvilidurosofof.pdfIn PDF document text
    • https://smshealthcareservices.com/ckfinder/userfiles/files/girijinoxinulesuligejazuk.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_off0000b14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14D 10844 bytes
SHA-256: f06423b76407030d8b17977ef4f4a55ff841d8da5d7828a414120a65ad0250fa
font_01_sfnt_off0000ca98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA98 15872 bytes
SHA-256: 099d4a2e28edd139c2807ec2c39b22d86870d35055db761e46c7f1ef74d280db
font_02_sfnt_off0000f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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