Malicious PDF — malware analysis report

Static analysis result for SHA-256 50354fa24d440cda…

MALICIOUS

PDF

101.4 KB Created: 2021-07-28 02:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4bc78ab3b4609bf300b162f2016221b0 SHA-1: 8371236a0ed2850ac4c1eeeaeb91be2f15eef9d9 SHA-256: 50354fa24d440cda00abb5a9727bef659dc45ede9f5b5a5d6d3281b9eb5d5fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the link farm structure is a common tactic for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://agrilaui.com/userfiles/file/pomatamonedubozinepoj.pdf
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/xipuxazu.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e101ccd01---7702839487.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d743e1380---xowosibujokulutatezorigeb.pdf
    • http://rspon.pl/images/wyswig_images/file/97922178808.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f6e8c36a7b79291c858a671cf265e093/84374016170.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/4ecf6c817f07981f758d50e20e62afd5/guziguvutipipa.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846ca200110---biponor.pdf
    • https://gea99.com/ckfinder/userfiles/files/linerofebitaro.pdf
    • https://tosto.cl/ckfinder/userfiles/files/puzesax.pdf
    • https://szud94.hu/img/sajatfile/files/57783286922.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d88a57c3e1---60660745511.pdf
    • https://menu2uplus.com/images/file/65997219477.pdf
    • https://tyko.pl/userfiles/file/fasafawajakukoxudoxiga.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a539e1ac38d---2326984161.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3d5o2l6hitsgteh068e4shnsir/89703985752.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070394dec61e---rebupupi.pdf
    • http://grabnerestriche.at/piguvolujovugapiraj.pdf
    • http://irollee.com/userfiles/file/45217411470.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084e38a57511---goxux.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a4cd139bcf781d957ec82a6df9ae0997/73042130459.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/6368944b178f6ae42dc6d99bd174f4c0/suxijexizopozufipu.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbbd9c8c20---gudozekom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=is+resident+evil+retribution+on+hulu
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dec.bin
388ddf2cd5d14baaaef8847a447c89b3e375d56d0da884f36835032de9da0dfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 10440 bytes
font_01_sfnt_off0001257c.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 16092 bytes
font_02_sfnt_off00013abd.bin
1705dbd7a6f0ac34935df0ae7ed25626214d33f4e785c070de32e16bbd47d880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 20276 bytes
font_03_sfnt_off00016dd4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16DD4 16792 bytes

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