Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d374fdb53cb52ab…

MALICIOUS

PDF

120.0 KB Created: 2021-06-28 07:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c18fe6419025df92c0d41321127e2b31 SHA-1: 5e66d4d97d971ea44785665a733dbffaffc493ad SHA-256: 6d374fdb53cb52ab40b8273c1ef2cf3cd078144ae7e72ef8f36db5d13dc172fa
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URLs point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a download button lure further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab59179c0f---xojuzoxijuganulezo.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/f71k5jqc1agcgqmb9ptilg7tsu/mazedojojujajobozerome.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077ed1851f1f---93059279136.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0ee7e7e5f---dibakelasumujuli.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081eb2ac6e77---88498839668.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/303b04446a70cfeb289c0d57b33985de/fugatuzozujokagiw.pdf
    • http://alliance-ltd.com/userfiles/9833747078.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3d63c730f8c98c15c8c795a11f19e58/38641465727.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1fc29eb0---75446612267.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/d6286a85da80ee2ea82aa762a1fb38e9/33074402947.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e26815b15---wuponevod.pdf
    • http://3xlove.com/uploadfile/file/69582284241.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e39979be2---dunitomivamiwi.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c27a397e89---37124690789.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e017e79494---45633500319.pdf
    • https://shop-ecobati.com/medias/upload/files/55633308821.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083925a64566---96689018095.pdf
    • http://okmarin.ru/userfiles/file/kijevew.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afb7448c1---10604920540.pdf
    • http://ahchala.com/img/file/kemuxirijunewagokenumo.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbefd904e---16136630508.pdf
    • http://grandinspirations.com/clients/75274/File/zuwudimule.pdf
    • https://tomas-music.com/contents//files/rozixewasesipiz.pdf
    • https://medtek.vn/storage/file/mosejonige.pdf
    • http://curry-box-deluxe.de/userfiles/file/guritoxofojogo.pdf
    • http://usateatop.com/_upload/files/vuvimi.pdf
    • https://.SharePoint.com
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=sharepoint+manual+download
    • https://-admin.sharepoint.com/
    • 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_off00017236.bin
974338b13c40697383505281f0a4ecc32a0aae16ec43fd2fc413f0b6c5127b18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17236 10748 bytes
font_01_sfnt_off00018abc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18ABC 16792 bytes
font_02_sfnt_off0001a2ce.bin
b7e7c306efcfdfcca50aa90e544036a28a842b4918c7d9e982a09c6d017f589e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2CE 18036 bytes

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