Malicious PDF — malware analysis report

Static analysis result for SHA-256 03afc3b2617fafff…

MALICIOUS

PDF

107.2 KB Created: 2021-07-28 05:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 170ed97dbe0ab6b7beadc71ed61af03a SHA-1: d89a7c79cc568791f143e78dfc3b1a593314fad9 SHA-256: 03afc3b2617fafff6fcbf5f4db57efe95ae863980eaa4ea2a82ada99f16a798e
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, with numerous URLs pointing to potentially malicious content. The document body was unreadable, but the presence of these link farms suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb4f8633d9---sawisi.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca59d56b62---jidasidujelokurezewujon.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mnjoq9jc3rkghd526gfgp91jfg/sobudesaw.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/54694367917.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5a8d8c365---voraje.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/20276085854.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2178813fc9---vakoriboxi.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072440bbdfce---rekeretijotovewatituni.pdfIn PDF document text
    • http://euroinstytut.pl/galeria/file/38567234078.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/rulixivikavoza.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/27176521435.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/31713193755.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/rps2fmsq1gmt31si98kkeclqpg/24662357286.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/85476077997.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/waxigosakarimizijikuf.pdfIn PDF document text
    • http://heizler.hu/files/file/zukar.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/kogataxodegolotemi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/b18f03de0ed2eb8539c8f063fefe89cc/sugadirizarubine.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077708dacf53---6001545362.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62b960557b---26013096604.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/40978299875.pdfIn PDF document text
    • https://datajournonepal.org/files/41106168265.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7ca7234f4---2235592243.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/zigaxobugonemusisidaralol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=idgam%C4%B1+misleyn+bila+gunne+nedirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010873.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10873 29796 bytes
SHA-256: 541808b201b3a694cd5e263d9ac9f46a519711536d45602e88be94235f16e424
font_01_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 10724 bytes
SHA-256: 8478b5b09103981a94abf8bf3f3be1246a460c643cc7bd83f89bd4f021093a0d
font_02_sfnt_off000155f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E09 19104 bytes
SHA-256: f0e9e161cc2e11f1156925db08e6ada7e5aee80849cbd6cc920a4542a7b71f33

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