Malicious PDF — malware analysis report

Static analysis result for SHA-256 c845046125c8109e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-13 05:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 755df3d93f5f48d5ae5a2c082af7dac7 SHA-1: 50e3953095a1efe79a2af4b376c482a1ef6280d4 SHA-256: c845046125c8109e1ed802b45c9361096eaced1d2e90844fe7d9f9bc39df913e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. It contains numerous links to potentially compromised websites, some of which are hosted on disposable domains or use UTM parameters, suggesting an attempt to distribute further malicious content or redirect users. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs users to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=remember+passwords+android PDF link annotation
    • http://soles2walk.cz/data/file/87536567523.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613728af39f10---17422148563.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/juxuwo.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f644c1e65---11194347536.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e0166aa130aa741b87b6e67f0cfd8c2a/lokoguzolusinugurev.pdfIn PDF document text
    • https://akconta.com/uploads/files/kogadar.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/watefoxudef.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210912233101.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/fexazudubev.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/patijenomuxikexu.pdfIn PDF document text
    • https://oasis-travel.ro/files/29644439099.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/kevilikogikesotiris.pdfIn PDF document text
    • https://vestol.bg/files/file/16462341419.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/67185526993.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ce7c41b04cc928440a1591601a333f98/bawob.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/divereguvajisemafutupojil.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/16325218691.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/tuzejaxekevirotamapibesa.pdfIn PDF document text
    • http://ge-mak.com/files/25741931782.pdfIn PDF document text
    • https://x-software.cz/data/file/wawugoguvi.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/90181526265.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613070ca97c71---96363961892.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_off0000e17b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 10680 bytes
SHA-256: ed70641de13bbd1c731b365464845c2fb00a9a8ead1fdf2d7ca4199a1f68d4ee
font_02_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 19100 bytes
SHA-256: bbdcca55de24cbd85b1528c7da2e13ffe9aaa5e419b087ad7da12d9f789c252d

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