Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80da5ad44fece8e…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 01:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cf3b6fc745c9c71018451686848f397d SHA-1: d5fd82b96e47753dc0765a860f3010188d553300 SHA-256: f80da5ad44fece8ec2adf23139b0c3f86a7aa4c167e14c5558cf09df165e105e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xeroxexpres.cz/userfiles/file/midawaz.pdf In PDF document text
    • http://sbs-group.co/userfiles/files/65508948143.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/50428885780.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/jijokojoneripesumimo.pdfIn PDF document text
    • https://argumentua.com/i/file/42495126841.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/pipajivezixalere.pdfIn PDF document text
    • http://falerisztika.hu/tmp/33392679745.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/29468597013.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b44a8d11---74774722867.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090f233d1155---39584971280.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/c32l18870uh4mo8fhl3iavekr3/85097110227.pdfIn PDF document text
    • http://tfforming.ru/d/files/tiwunozezokedowejeroriwil.pdfIn PDF document text
    • http://hodori247.com/uploads/files/27931921100.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/xexumodufalozanifop.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/14608070428.pdfIn PDF document text
    • http://chinalabware.ru/d/files/47722441502.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fc7u64tm7la8ddjr0r2fmk2cmj/toxigokuga.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rceeqasghki2sshq7heacn53v2/vemegonunot.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082569479dab---rotulozozelidapixilewoj.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/valosuluxijeluti.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/84040743722.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35ad9a9d29---28970311377.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/setikemixiwaninesiw.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/tawusiwapuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cameron+and+quinn+competing+values+framework+pdfPDF 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_off0000c036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC036 11484 bytes
SHA-256: 3f7d4542480d0e3c12616538ac2ff3eaa617ffb9b93bd9abdcbd8f0555bcf30a
font_01_sfnt_off0000dae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 17252 bytes
SHA-256: 1fb6d0ec4e5e66db9d4d9a03a91c88870c0cd4444634f92b210fafebb4cd2359

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