Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e29d8470eecc43…

MALICIOUS

PDF

68.7 KB Created: 2021-09-30 18:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff11a2c8ef92138c9871ce25ee980760 SHA-1: d0c8075ea0b2a76749fb6aa144b1b8be6843f31c SHA-256: 85e29d8470eecc43951dd778cc3854b73236b8a975c31beb83fd422cfa4d90ed
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/90276943353.pdf In PDF document text
    • http://yuh-tarng.com/userfiles/file/9357542826.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/39c462679e6b1300ed693e20953bc564/nomigurolasumol.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kisijavurisumijibili.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/39085988343.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/kadowisekoreze.pdfIn PDF document text
    • http://kunbot.com/upload/files/lasotabax.pdfIn PDF document text
    • https://senegal4d.com/contents/files/panivuj.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/zamuletewimimu.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/37561554845.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/67740691351.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091820204898.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/zizomuforudivun.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/xapulojuwowule.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/pelufubelifilega.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/88083733898.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c78de6c6c3---37685757017.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/noxipugafej.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/21245308409.pdfIn PDF document text
    • http://xfswchem.com/upload/files/zebokofupuxigebanu.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/63915780164.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/27594336023.pdfIn PDF document text
    • https://gkscam.com/userfiles/file/domilabarobom.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210924060748.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d4f73c986---71998963861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=play+music+code+androidPDF 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://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_off0000b081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB081 10648 bytes
SHA-256: a80f54a9355e5ebddd7b40d98b399675e03f1abd957e981334a179418da64772
font_01_sfnt_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 15096 bytes
SHA-256: 17b32c2dd9bf0c083b5625ed8f1a00501b211d133dbf0cf98e7220d552bb1e0d