Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c062492c5ca044b…

MALICIOUS

PDF

87.8 KB Created: 2021-06-25 10:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 41775f42267d168046a13d3356c4d3dc SHA-1: f105911615ec93de1eb0b0fd040cb1acb6147e2a SHA-256: 1c062492c5ca044bf5b3ccdf916f86112e762749770370ac45c8008cd6382bf6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, but no direct instructions or lures are readable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41c1db448---13353362888.pdf In PDF document text
    • https://tenfci.org/userfiles/file/loduwafojeka.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/8714845d2fb622bb25642502d0879309/nagikofasogu.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/2q3cjvjm7595819uhgn2lak1ip/sijokek.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec547199aa---44809971103.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/tiwulu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cf090a1a81d8d9e39d780499fba77017/lufokoruxewo.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/hgkc891geoisjpmcr65l8g8f27/bavonaz.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a56f078375043bd71a4bbae0545db191/18638675224.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/17818932500.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c57acf3b385f415973595afc252e1984/buganizavepejur.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/9ua1ellctjc7bjjrdrcvseo6r8/migubil.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607424d3d98de---kunufimakirofabotoborere.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/220b59a45b4b4efe5417c89c73093a10/9909012116.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc130c941e---92857149441.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mewtwo+pokemon+go+legacy+movesPDF 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://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_off0000fe87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE87 5480 bytes
SHA-256: 05bc4de8dc13bc46ac8c6f73b05f42a4783fa9e92d80c803937db3a4fca672f2
font_01_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 12948 bytes
SHA-256: 59c7b133bfdb2ac59dfa5e4f2d8cbd94cd4c428646cf70a7f47f1af132cbede0
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 16096 bytes
SHA-256: 2893e3b8b18ac9f9e2381aaad145f18d8979a5531fd1b791c7b07cfc815fb7bc

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