Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc047e5053f8c81…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 11:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ec211c4587969e1fe7209d012335b056 SHA-1: 293aa53b13ae7faf3b76fad1938717514c70159c SHA-256: fbc047e5053f8c81b113e4a696c5f17ac2aa292f6cb55c9ef63ef49146e192ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly supports its use as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://medvor.ru/uplcv?utm_term=unturned+metal+window+frame+id PDF link annotation
    • http://gamjagolla.com/uploads/files/86379953625.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gakorimolafozozunib.pdfIn PDF document text
    • http://0048.pl/48files/file/27022673028.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/jurewuviwupejuli.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/14006576716.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/49436795502.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/lakunakufefirovo.pdfIn PDF document text
    • http://ombs.ru/uploads/files/39863685430.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161442f177dd4d---nevin.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/jejijufuxozoxedotugizupep.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bibatafexide.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/supibojoja.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/ede608961d4b726d3bab9806fa8c98b4/jevolevupuz.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/10eaa68afa19663224a893ba938982a7/1366240303.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/11225523665.pdfIn PDF document text
    • http://st03.it/userfiles/files/wopesud.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/seruzaxitosalukageked.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210905_9CBDCD06C9314C47.pdfIn PDF document text
    • http://es-iyashinomori.net/yamituki-n/uploads/files/tukatuwifarugabojosopazel.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/67480524730.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/jepimimo.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/29777967351.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f00479c8b7---77286619269.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_off0000dd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD77 10540 bytes
SHA-256: 9f5723c4b68235709d593beab368a186efafbe61f6ee93a7f3d631a0c8c501bc
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 17128 bytes
SHA-256: 18f4f8fb5c7199e9644bf0323fe55b937ccf7e66740866b50436e1be1743a719
font_02_sfnt_off000121d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1