Malicious PDF — malware analysis report

Static analysis result for SHA-256 205260d7ed2c6300…

MALICIOUS

PDF

83.7 KB Created: 2021-06-25 13:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5d79b2d49c71c0c483aeca2bf432ceb SHA-1: ce2f62b778b04295df190a9da8f39bc2f8589956 SHA-256: 205260d7ed2c63002683bc222c65dacc4c1dc59906597f9ee074e00474742d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1eb1d0da53f86499bf77332ee0c26ad/nerajijago.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/00a1ddfbecb6844bf59a7a5d5276a119/xapujalexa.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/1099d39198345b1edfb24ec329356415/wixiviwutopivaluk.pdf
    • http://veterina-hrib.cz/user-uploads/files/97919512063.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608739d4929c9---4609240296.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bed0cef25---92691869663.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d985720f79---dokosufes.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/1c5eed110a2ce7407a15dd3da8da5141/fazawuwopunukoxonojul.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/b644545a064f45dfca36f65fe19dd774/jenukatofidagezatonaxu.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/04482dd0c1cf41ad3c12dfea878bdcb4/35661454323.pdf
    • https://nasselgrundet.se/anvandarbilder/156/files/juvatijapulivavekitu.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6779f0b1---wabegadololovalo.pdf
    • http://qtjdb.com/UploadFile/2021/05/25/file/20210525_160626_182.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca223441db---78268551839.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5ac8fa88---sadugo.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a188d3afeed---50376763930.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+latest+windows+10+iso+file
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e454.bin
602234e51d0880b5f10ca74f9576058504ac31e14b6a092970b38717bdc1785c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 17340 bytes
font_01_sfnt_off000111d5.bin
f988a2dd52ce4ce7b2d03d26364c908ce7027344327798c54122f9f7abc1a2db
pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 10500 bytes
font_02_sfnt_off000129e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16792 bytes