Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f757577e7e764a7…

MALICIOUS

PDF

93.0 KB Created: 2021-06-30 05:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4eee82b11ef23442ed2889d2e5a3a5ce SHA-1: 111fe6eac1a3e11865b16af702c950afd4b77430 SHA-256: 3f757577e7e764a74cec9f9ae870c9674cfb02cfa77ff08b1a4f92af8f8c6b18
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and potentially disposable hosting sites. While no scripts were directly extracted, the nature of the links suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c062affc475bf89c882563b0c66da337/peliwo.pdf
    • http://studiotecnicopetrillo.eu/userfiles/files/96188388574.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b290bc39bab---rupurakiwekovofog.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/bf1d895941a5b35680e07f6785264362/nudifotuwezolifidu.pdf
    • http://matstravel.ru/userfiles/file/fisararon.pdf
    • http://thangmayedex.com/webroot/img/files/ginezotupobomin.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ada1f16094f---fokavofemu.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072170c8ec8b---38641848789.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab169b6fd8---65728330026.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3653a94fe---dalulazasenivizunadej.pdf
    • http://uhy-th.com/image/upload/files/25225801081.pdf
    • http://shuimotongyuan.com/userfiles/file/272621015.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d67b6ad0e3b170b4a1311aba461c8d62/38948535952.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3856c052---56191347524.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b41ca5aa7---36961526588.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/23046f4ee1184301cb5861e6fddbca09/86398891888.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c300906274---dumifitozowuwiv.pdf
    • http://mini-garden.ru/userfiles/file/ledoxuxabipi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac73306627f---logemibagunululizo.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160720211f2f9e---50117770478.pdf
    • http://runo34.ru/attachments/file/8086104240.pdf
    • http://universalgroupautos.com/files/others/99411051031.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=heartburn+and+acid+reflux
    • 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_off00010bd9.bin
8f23b80ebad7652e85f84605c3bdd1d9b4e7440523318d1078b69c92b1e99597
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 10516 bytes
font_01_sfnt_off000123d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D4 16792 bytes
font_02_sfnt_off00013be6.bin
ffd8e4b52fdf51766bf601f57e4e300c6543193967ce5754fcaf499d650ba7b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE6 16616 bytes