Malicious PDF — malware analysis report

Static analysis result for SHA-256 94844d8acbf55728…

MALICIOUS

PDF

94.1 KB Created: 2021-07-03 14:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c66b1efcfaa79a91c0ed45c36622d499 SHA-1: f23d43ed74cb477c9a2211e5df25b41b70b29b8a SHA-256: 94844d8acbf5572823bbe00e20961f699dff56da154cdfbc7ccde4e0a3d97ef1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to lure users into phishing scams or malware downloads. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=linear+equations+in+one+variable+pdf PDF link annotation
    • http://innospectrum.eu/hirlevel/file/81461461173.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/44025106519.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/2988087163.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474dba5deb---majugikepawidige.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/c5cd4acb09ce2de7bcc7982210c46730/pisojimaxodav.pdfIn PDF document text
    • https://ms02bet.com/contents//files/74763657395.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089be76cb323---madopozojuv.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a458f705617---gurig.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/putaforokugenekajobufojif.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/sunetiwulesazujoniruzime.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b60f366975---3688996714.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a97a8efd6f---kumoban.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oe12ahicilc200pknp0p81pd3/35076146455.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b996b3076af---39862658139.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/tapolikebu.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/19564398453.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/11130833632.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/49245172806.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/68940254071.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/b50d6801e7c49945807397f3e8e04ea6/65426400719.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38067c9647---2201258825.pdfIn PDF document text
    • http://zcapitalcrm.com/app/webroot/uploads/files/64957375112.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/46432309758.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_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DE 18112 bytes
SHA-256: bb5d88b28b94fd0f2d793de5c7509c55b1ef4c85a0c92e6fded3c58d9f6bbc76
font_02_sfnt_off00015206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15206 10900 bytes
SHA-256: c63a815cd95e20f854c1d8010fb45fe78fbea4698e8fdec955b45703b19239eb

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