Malicious PDF — malware analysis report

Static analysis result for SHA-256 73094337a53db621…

MALICIOUS

PDF

87.6 KB Created: 2021-08-01 05:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 39273b3b656801a54543b8087a9b79f8 SHA-1: 0b2c240da1f1e5865ae82972c663470c5648827e SHA-256: 73094337a53db621d7b0f5a64e92b96c12fe8d6ceb5d6ae89c9d1093eedde13d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure-based nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/7464528180.pdf
    • http://guides2alpes.fr/uploads/file/zokigoli.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160745070b43f8---xizebemafewiv.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/pelajoxe.pdf
    • https://rotherelectric.com/files/luninolotu.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08606d87c---23836862193.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec004aa8cb---10962912028.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607de14ea67f1---rurosewivumelumexejapu.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078143e8647d---pilawokubuworatudaboton.pdf
    • https://slide-bearing.com/d/files/54993648286.pdf
    • http://chiesamadremarsala.eu/userfiles/files/12297868574.pdf
    • http://linkingpeople.info/userfiles/file/xigukipemoz.pdf
    • http://sklepjola.pl/userfiles/file/kuwefukimusakakelu.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076982479927---zurimajexokuruves.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6dc5ab9808c2c2e1f2baf0d9c3499999/35886740272.pdf
    • https://emprenderem.cl/files/gigagonelejapuladijutak.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/488f28425df8a9f5ae950c0afa53d23a/6264895458.pdf
    • http://119hero.kr/userData/board/file/dojuzomuvow.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe521c9ecb---robigajopobipasopurubow.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/c418c7887433f741b509d36cc3009532/rineledo.pdf
    • https://partnermind.cz/images/files/puporogavedekavisagilunuj.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+install+gta+5+for+android+free
    • 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_off0000f0d6.bin
3cb6e5fd07388992cf29abd36ff0a9e1a73528b85084a9484be9715b9fbc63eb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D6 10740 bytes
font_01_sfnt_off00010982.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 16792 bytes
font_02_sfnt_off00012194.bin
19e429196dc0c56009b732b21e7e78530b28df26889f9b1642680d7e31bd659f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12194 17304 bytes