Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76be9c594402ffa…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 22:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c548a510e37ec158aa00db5abd9a13ea SHA-1: feb8eac3ce8ab0c7fc13e78cf51f532be710d6e9 SHA-256: f76be9c594402ffa68fbd2d000fbc0b70828d8ef5be4bb58f75d402136a6f234
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lure users to potentially malicious content, likely for phishing or malware delivery. The presence of multiple links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608494bb98816---51125336409.pdf
    • http://nsk-nalogov.net/upload/files/43135572028.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/67a0c7d7c6d42fcc625929e0ce074af5/64995845362.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae33566caf---58480444403.pdf
    • http://steakclubhn.com/campannas/file/kosepopabemilutig.pdf
    • http://hitecds.com/userfiles/file/63679877191.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/51916436f1f71b1d00b2f3e7e9c41dbc/67695183756.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c6464cc7d1185ddd5bb5de9f6496ea5d/89024842790.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b43001cdeba---60863664806.pdf
    • http://dharmapremipariwar.org/userfiles/file/20370746668.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9ce5b4172bf9648c9852d18ab2989197/81006459286.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4875a39ec3---dilinodigofutusikunozin.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/i50sejpodu3l102duert4cc8k2/memapativ.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/1be73ab13be6b0a9399eec8593d5452c/jiralid.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/036mtf3q97jieunvnnomlkc9o9/zimipavutefupebotep.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/adqn29roqnfk2fb5cp7a7vo3q5/88219580486.pdf
    • http://adamlegal.com/userfiles/file/gijosivetaferoxil.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e9b17577f---remisivulipi.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79d3340fcb---xaxolubiritezevazawijirod.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a6931ba6de9649c6aa36a7c06ee0cb5d/dobal.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/lasuwugatiximifezifa.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d78253261b331c5afdb218d6fde07c39/gevodazelabukonu.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160dde9cda09f0---94674207779.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1ed2ef992---jesutakanabajujiveduz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=color+by+number+free+printables
    • 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_off0000ed89.bin
c070728a8e3a58ff8eb740c252538ff4f60416bb669edc015e56a167266c38b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10904 bytes
font_01_sfnt_off00010699.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10699 16792 bytes
font_02_sfnt_off00011eab.bin
2fd2fa04ec893575cf2919eaf962721a9726b61af872a02cfff2013b5b07cdca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAB 17220 bytes

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