Malicious PDF — malware analysis report

Static analysis result for SHA-256 b540bceaa7ab2590…

MALICIOUS

PDF

84.6 KB Created: 2021-09-24 03:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3480bd0a04ae0fb99fdeaee568b81fb5 SHA-1: ae07574cf01116a67aa81ad6c10ad41e2d2ce265 SHA-256: b540bceaa7ab2590dfd4b7e2578eab3c02a9a7e73e85072936a5cf156dc58e20
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farms indicates an effort to redirect users to malicious content, likely a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=thoptv+app+download+for+android+latest+version PDF link annotation
    • http://140.121.161.111/ckfinder/userfiles/files/6870098068.pdfPDF link annotation
    • http://tw-echen.com/uploads/files/202109190647526606.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kefojixixokuk.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/torimo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mso8ajd8ai3qmmev23j11o94cl/vejebajuwuwijanovodi.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef928906ca---2894623546.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0be510982---30003724036.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/94915737854.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/sirasetetu.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/46754786020.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e3ac4728c---28050675539.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/84892467250.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/pefofesesudixe.pdfIn PDF document text
    • https://alev.az/userfiles/file/488073551.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a30b98306---65431755907.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/25627207021.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4e3449abb34fb9fdf19d706d77df95df/74167769157.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/xugekofegagisafatejiseta.pdfIn PDF document text
    • http://hla.vn/upload/files/limuluvibugewomigonukova.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/2263560210.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/povabujigexisarevubafa.pdfIn PDF document text
    • http://z500.si/files/gedav.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/zamav.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/denojozezuferazudozanif.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/migomoro.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0b8aeb1c4640ff356d4ff185b08a0f2/1411726694.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 18696 bytes
SHA-256: f4f37c3f59b8afc3403a5a2e279a77bddc774830f366bbeb4b122fed56a3489d
font_02_sfnt_off00012c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C49 10712 bytes
SHA-256: 3362d5003d95f6ac267156adf657a979b64f6e1cc338d809ee4dc9583ad61bb9