Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6d664579dfb3f96…

MALICIOUS

PDF

69.4 KB Created: 2021-09-12 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b028e644316a0e0bd3499554de01075d SHA-1: b852ba48ad7d2302c8a10aa1d7c89125f3840f50 SHA-256: e6d664579dfb3f96ab923479409a52305d78b7dcaf7e3ddbe096ab9ca5e6b3f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The presence of 'utm_term' parameters suggests a phishing or SEO-based lure to entice users to click through to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=android+view+pdf+without+downloading PDF link annotation
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/50163019084.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/xomepavokafafefamivog.pdfIn PDF document text
    • http://artattack-concerts.de/files/file/lerisakutisibak.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/4637796282.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/luxurozodemajan.pdfIn PDF document text
    • https://umartravel.com/files/81407538190.pdfIn PDF document text
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/xujenubuvogaxavijutaxa.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/25275481951.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/fisunedepaboxesarizi.pdfIn PDF document text
    • http://citty.org/images/uploads/file/88256980735.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/65720446871.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/42773649475.pdfIn PDF document text
    • https://rmduncanrealty.com/userfiles/files/dosopeduwe.pdfIn PDF document text
    • http://paliukenas.lt/i/File/tisuwododabakavanasal.pdfIn PDF document text
    • http://altera.ukrstroyka.com/content/xuploadimages/file/fefewamuzenadeduzan.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139206b1f4d9---32305370971.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/28630093500.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xuwubamazaz.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/83327510644.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf10b1a378---gukarisajeloketud.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/bodipanefaxuwime.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pejodozon.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/72446000972.pdfIn PDF document text
    • https://icbacademy.com/upload/files/9617286767.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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 14224 bytes
SHA-256: 184bf54a62597ace54db73b6d2104868a014b43230bc882695055bddeb6d4874
font_02_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 10840 bytes
SHA-256: 14c079052180e19ca9ada7e486d3762c950d139c96b0dde8cd5dd96480cb5aae

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