Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c0b32c1552041ec…

MALICIOUS

PDF

74.1 KB Created: 2021-09-03 13:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7727ee2401a3dbf7e6f730e892e237b SHA-1: 645899a6ea5ebd0005d70b9a20c8d6ce54150358 SHA-256: 3c0b32c1552041ecdcea7ff21f4937a11b2b0fc99bfe23b8046544439132093e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://travelsi.ru/ckfinder/userfiles/files/2782960636.pdf In PDF document text
    • http://ceskylakros.cz/userfiles/file/pevujupikupevavugezirulop.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/38562725523.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d15c4272fd9d7a3261c73d7a96843cd5/sifuxu.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/pujagiruvuxivedotoxaxuwof.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/2030780311.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160974b36a503b---fiwuveziwuvajalo.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/supab.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/ronumipimuza.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae017420d---99278148070.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/cmhhiosvd6l74f4rf35lclt653/rekuwotuwalosojabenidud.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/dqcb8sev8vv2m92spu17eghsah/65076772166.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff566be733---mopud.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/3761809671.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090a7f8e932a---85729253674.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/o45u0rubimdfijcvch2qs087l7/nogal.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/7a6a0f2340e62aa7936cf51e84761352/kifelufibazodonugetexek.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/60515825181.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/f54f6f80d2b1296204eaec257c996082/78299261273.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161024c2161458---xusurifajapomobemi.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/56606709126.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b7a787f85---sebodomelofekoxaw.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082128dd5944---dolomadiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=presion+diastolica+alta+causas+pdfPDF 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://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_off0000bdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 17468 bytes
SHA-256: 392803b7de48a56a446f3c534d4bbef083b4902037ddb9709b0796c84bcd1716
font_02_sfnt_off0001025d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025D 10712 bytes
SHA-256: f7e3f937cdecbc4ec3fe544634e9561f4116f3a6587d1589f00416c1b6f3cd3f