Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba76cb7e37ca638d…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 17:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5c420943d6282c75139e110573e24dbb SHA-1: 038609620f1fb490a25d9fb1d7370aa9b760ce79 SHA-256: ba76cb7e37ca638d752f0b40931caea365b8ca7b8b0e85c97bdd112851a4dcfc
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress upload directories, indicating a malicious intent to host and distribute further malicious content. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or malware delivery via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ec16d5bf2---69157587793.pdf In PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/nb5ge5vl47dbekngoim15rmm85/vijaxonarusirav.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c780a5d10---85141272927.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/38736718125.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/jafogedilifovodi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f2acba509---19384505751.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/kapaxoguzuvefadiwitodobix.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/numizonurivina.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/fd761cdf3379b83eab5de321a76b582d/62615037964.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/44275114216.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/17118037271.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4cbd047c5---39611553664.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/4b4r4semsj1f6ac2jffbi0g0vb/juxokunozox.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608648c8e9f8b---41684187031.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/f23b057a344ea1e7a5898fcc0c559d30/bemozisoxadowekozobokokix.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607970be4d033---tixilipujoju.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7d62d252a---65085005929.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/kipefegav.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/79479826029.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/jolulipokomowazagumizud.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/708ad0j4t3ac6c48r6kvosgtei/mujapizunesazegodobad.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/idoitr2ces28r7o49e3rso1eju/53205286640.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lkebsoddm25ntvj8mp6bpfhbu9/77214422239.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/59491344831.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/slgfsi6kfs6f599j9sv36kt57v/42565546908.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/75019086956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=asteroid+on+its+way+to+earthPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 18148 bytes
SHA-256: b6581180cd74cb2f76b7b5cd3aa0029f4241d274b760507b3c38677ce0a39610
font_01_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 10480 bytes
SHA-256: 8837e881996bc6901789d555db493919b88ba2db16cdd8bbf9df46885151e7bb
font_02_sfnt_off00013a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1