Malicious PDF — malware analysis report

Static analysis result for SHA-256 31004dd947d56432…

MALICIOUS

PDF

93.7 KB Created: 2021-08-22 01:01:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ac3418a70679d392df71da0bf1d7fde SHA-1: a005834059cfa866cbd34fd7921f4149396e9f09 SHA-256: 31004dd947d56432af7c06f9b71768666a01af883d8782cc15fe8816f5279e77
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, suggesting an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a phishing or content distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9qht8td86lni95ddcviucdttrq/85047577101.pdf In PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903c9fe8fc1---78219483298.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96f15234f7---28842833121.pdfIn PDF document text
    • https://topupdana.com/contents//files/xedemiriruzis.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/renine.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/161060b628380e---36008643471.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/tobizadufudaw.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/25788360332.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/5650746939.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/tevumi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9qi3ollo2djea7jmp7omsmne7t/tikusujidunupamezet.pdfIn PDF document text
    • http://lighthouseofworship.com/clients/44803/File/bukuwevanuxas.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/22036484153.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16087b06c6f908---35653068737.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161182a9d97fff---giwitoludavivupumuzi.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4264b0437---93127087370.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d921f8c40818efa59a2c0a2871347004/tojesumaviwureta.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/nuvopum.pdfIn PDF document text
    • http://guowangcable.com/d/files/moxebaxademerez.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210728053830.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b702f502a728db927e7dbd7fcbcd9ea9/92314234729.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16098991c6ae1f---gijovexomumobizas.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160818d8b827ba---51160932411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=tool+shop+10+sliding+miter+saw+manualPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210705/16254152332346.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_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 11160 bytes
SHA-256: fd89961b911dc3ab1271a27612e193a9e60000cd959ab53461098dd0f2a51da2
font_02_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 17308 bytes
SHA-256: 03c00c933ca626248fcdb9c37520375f1654a7096a635fcc45c6c4590f35beee

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