Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5db6a233cde182…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 11:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b32dfdc795165002e6fcb8e157e3be4 SHA-1: bcaf7b70f377f87e2e4381022ecb8a31a814ab5a SHA-256: ed5db6a233cde18276d9aed81be78e7906a71765eeab2615e7357680b3d9c45c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. The PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=13xx7+movie+download PDF link annotation
    • https://newtop-eg.com/userfiles/file/sadunitibakiwuni.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/bajezukofimoja.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/tepijup.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/boxamuwikunubabimizi.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/2d3da9fa7cf89c451b6f3c58e923d809/fuvopawoserugum.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/54203069456.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/zebasaf.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/abff999551c60aa36ea49bd2b2f2addd/11266838881.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/25835660042.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134de3c4cd9f---dutowiwi.pdfIn PDF document text
    • http://bastola.org/userfiles/file/lupuki.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/3885930118.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/baxefalur.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/92824767105.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/dakizalebine.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/9111079311.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/towisofezajo.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/20656344754.pdfIn PDF document text
    • https://spyboarcams.com/files/kulerizixuxap.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/2006849065.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/71142322399.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jamekarubamotitizosema.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/xedidiwaj.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_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 10476 bytes
SHA-256: 487eb3426f13aafb07ef15703467696e4f3a6f57880ba18a44572ba008131074
font_02_sfnt_off00010c79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 18320 bytes
SHA-256: eb68f1efb3d14f2355644c5f082c13b46daef7dba544d218982d0e783fe3389b