Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0e4cc8b4a77a59…

MALICIOUS

PDF

73.7 KB Created: 2021-06-06 19:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9f473c1c42c2ebbcb555564b65700923 SHA-1: 11bf1de96dcbbbcbd3ebf76e6eb31e5ca726437a SHA-256: 6b0e4cc8b4a77a59f2725dca87e79d4542ee7677cbf8eb7a153f1251cb7b839a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a corrupted attempt to present a manual for a Bluetooth clock radio, likely a pretext to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cructi.ru/uplcv?utm_term=onn+bluetooth+clock+radio+with+qi+wireless+charging+manual PDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a686bae164cf1d62c7a7e2c02fd95dc1/17438373510.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1cadf3132---jofuzudanojija.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/98db1948497208e6fee279a63dba08fe/52591240131.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad638b1e1a7---jalademizona.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jm9e7bfluvp253mqnqp15c3mtb/74811890870.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b43f29c076e---99345889764.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b90e1627de5---55068622473.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073fad51f7bf---32387375310.pdfIn PDF document text
    • https://ancoraeducacion.com/images/bakopisebivapuzibigib.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/zefarawirubivuji.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/51967689001.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/vusixadavadiziw.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a259bbabc67---40865925257.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/l0d1m0m69erru6k5ntcfi4ls54/kogagiretelid.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/29164463494.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a07b3daede4---24481651675.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000cc30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC30 5800 bytes
SHA-256: e2df63003e2b3043a4e240b48771be9a4df288966de7bb5523082dab677e4aef
font_01_sfnt_off0000dfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC8 10516 bytes
SHA-256: 27de5f2a3f94bb03170210551e550fa9ff3a4eab6500d25ba7164d2ac5764c44
font_02_sfnt_off000103e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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