Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55fcb512aecdb6a…

MALICIOUS

PDF

96.3 KB Created: 2021-07-01 09:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8e496de88cb9191d18b3b8c48eb8a5ff SHA-1: 464d37a67528922bc0f67603f09e0a9c041fd10a SHA-256: a55fcb512aecdb6aa118dea54daf7fd19e83bdfa6d1e5cea53e48ce84bc3ea57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://chcial.ru/uplcv?utm_term=calorimeters+are+made+up+of PDF link annotation
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088dffcf1088---17509433760.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eda92dd9b997bf9d54047412cc25ddba/bifanobanugasi.pdfIn PDF document text
    • https://designclarf.it/file/42639219127.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aeak82svft3uarf3lau0klvbs6/wolobaruwexajekogepefuse.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/bi6q1tcl4j4ga8lncltlp0ftsv/bituzuvovapagade.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/o76lv7qif59gugltvpbd920vnc/52535692592.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc49773d86---51497661107.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1b9e4bf8---xakatudufowiwipevutarej.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/de7cab97d367ffd5b3cecd8757374813/porutonebojer.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bee393650---58489903162.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5154896dc5d060cc27c3e569740bcf4d/32582814925.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160772cc76fb78---zonegerovefelivedabamot.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092235817ea2---46144997431.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/cnbtb9qrlb9vvgkra6giik49rf/nimazaxanugolen.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/akc13721hnrd4ni2tbauc04106/8998857305.pdfIn PDF document text
    • http://recrute.fr/files/files/73916732498.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/puvijinepunananosuloti.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15cd1308ae---dedopapab.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/simovozuruxunogivepobew.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd1ef48bb1---66112326871.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nexifamevukinilinajevope.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/nhd28jrqpp9l8og6l0r3bi3pr0/nekutafisaniwitigubufarow.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6783dc11c---58825292511.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c94c147610---vadeninotuxavafewew.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/ggqu2pratknpaohb62oh2dpojm/zufutadimavefuxuv.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/jelosijexatubuponorewol.pdfIn PDF document text
    • 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_off000112c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 18584 bytes
SHA-256: 250e6ff74f9a910b9a5cc6e00aa18e1a17a085a75184ddfd26b9a568401a7e69
font_02_sfnt_off00015b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B8C 10688 bytes
SHA-256: 1a6bbff5e48d19dae892abcc510a3bcb295d4b213abc3a4023d0b5c3ac0bfd16

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