Malicious PDF — malware analysis report

Static analysis result for SHA-256 61aa511b99b3823f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-04 14:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: af8cb202343b69f010efcb965259b7b8 SHA-1: d4f52ddedd5c411187185c535a2b47ef301b11c0 SHA-256: 61aa511b99b3823fb5ef7ad050ddd6c1ef68fbd4c582abdaf31c4b933755a4a8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is unreadable, but the heuristics indicate a focus on external URLs and link farms.

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/10e10df97e9de09db3f358c31d4340b2/mubezidupirujifejo.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6509eaaaf---46788383536.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/mubhuj8325qq2nn6e4tt0kpgv2/30014300884.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/1ea2c44fd3504739ce3152831d61b913/delojo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b760ffbc1a7aaf237150a5405f80851f/tikojajomobivominu.pdfIn PDF document text
    • http://sksound.com/userfiles/file/17357323684.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2654a80172---37445895095.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/42444609946.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/35079902108.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/4858234471.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e1fc58f27a---92815970328.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/bivofuzetigomasav.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/57jr6saajgavtur0tn0g0ftp45/59228451183.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h2he8vvgmdtfm63lf9s7rqgskk/gifugigelaw.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/dobibimujeko.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/mamivobugekuwamir.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/85qcj74hsgasv1gck7on3ljfk4/23368170498.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/6877b524f2780585251c153d5cc39965/bajevasexitofajiguweno.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/509588e32455a01229fa30d56b16b7bd/jopuzosarumakokevefogezug.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/mevumuroveg.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3fb76106b3376f53b4a22027e4e10cde/videp.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/28541696024.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e00930cd---nagul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=southeast+region+states+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF29 18948 bytes
SHA-256: 79283f77923ec4f3eecf39885d8fa633fae1b99ce8dc1dcec050b9de07f188f6
font_02_sfnt_off00013039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13039 10696 bytes
SHA-256: 260b73a7bc4329ce119ade2f0bfb9840430b451c05a566ba5a1a7372bfd8a2e6

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