Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c84c8fd4dafb815…

MALICIOUS

PDF

83.7 KB Created: 2021-08-29 11:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 33202f7853dd757866efb160d62db6d9 SHA-1: 170843d55bde008d926ec6bf8a0ce81d7a30c46b SHA-256: 0c84c8fd4dafb8159e20b76c76cbf5ece573e144482886bf4fe56fc916ced06f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc977265397---vilinusetegubugetofet.pdf In PDF document text
    • https://mzlpro.com/web/img/podborky/files/93792399950.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/wumizegafuloxokusuwupere.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/maglldhikljsmadd4l8rok6epn/matejidelitab.pdfIn PDF document text
    • https://wrd13.com/force/file/diwezisasevekajajudapaliv.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/k36dcfbbercj9js5hgfnf0s2hd/tezexidetutavosevimipem.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608534d878ea0---reverulegu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c6858c6d64f---82399813845.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/91707814455.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/kekixoreniximawusajusa.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/luwovisaratedazifumexuseg.pdfIn PDF document text
    • https://energooptima.hu/upload/File/goperosikijepizalokimar.pdfIn PDF document text
    • http://immopolignano.lu/images/lamuw.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/47958779873.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b3b73ef83---nobuzipedajirabis.pdfIn PDF document text
    • http://aplus.to/userfiles/file/57733036530.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/wokolujirizek.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/55928136521.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/31737725411.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160893f1275ee5---zadojo.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/48848662555.pdfIn PDF document text
    • http://klpa.net/userData/board/file/84122650670.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/61568380029.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/92066541885.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/56476714212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=solving+systems+of+equations+using+tables+worksheetPDF 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_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF563 11480 bytes
SHA-256: 31aa2dc78d0c287ca4753d022341d4e7fd56bd5bcad334faee6f6fbe384a6778
font_02_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 18480 bytes
SHA-256: d290fd31e1501ee1ceb20b29e51772f32731254a9daae86deec371c06b5f1caa

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