Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12c9948df01172b…

MALICIOUS

PDF

89.5 KB Created: 2021-06-28 23:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8989e76a34c2b1a432c76d201dbe7f52 SHA-1: e044dcf9456ed63c290f7e8af6597aa4ccc06f50 SHA-256: b12c9948df01172b1f095287ce10525f0b6bd59aa831a3ae13b733a6c71a7122
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a link farm used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://crewmak.ru/uplcv?utm_term=charcot+right+foot+icd+10
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7374ce7bb---13796697017.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/51voc7246vrqhe17lp87l35ir3/50434961315.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d97b7f0a6d---zibejimoronitetatiw.pdf
    • https://clickkedai.com/userfiles/file/nuxipagozudox.pdf
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/taxapi.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/cdc553a23c016384740ed0a30dc16101/rafajilurikofubowemid.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1106f1f3405710d505d9e85319e30a4/gisulax.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/60a4324ef8790f28ee6a5945b0d76bdd/2554635935.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072482224727---62822157839.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c083387e81---66247798622.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1a5d561f---diropodixibiweju.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/sv19gahvhmuu7l4oe94n5hrnb6/fobizolebobazelodadivog.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/dfjmsf3iifqpb32q1bbol7cfc8/13069551934.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd28a1f7b4---31152056974.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f1512e28060902e1d844e64045595711/50917528812.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3p11b4nvr0bdfqj87f6njfus9f/rulawexeridov.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083175bdd5b6---fokavebibowo.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f78b219ac---44103755767.pdf
    • http://talani.nl/userfiles/image/file/vazujijelovamiwelonizi.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/95703823527.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcea13bf6d---zilurarogog.pdf
    • https://matrainagycsalados.hu/userfiles/file/23720188865.pdf
    • https://girl0229960192.com/upload/users/files/difage.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb40.bin
99d93df5e7be962c5443c0c41d77e714a2e18dc44c48564b050b2b859d6e0b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10508 bytes
font_01_sfnt_off00011328.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11328 16792 bytes
font_02_sfnt_off00012b3a.bin
e6803618d517287e4fc46a64dac599ba8643e4171b63958ad451c478957d3c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 17536 bytes

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