Malicious PDF — malware analysis report

Static analysis result for SHA-256 954a7d8920dc5205…

MALICIOUS

PDF

80.8 KB Created: 2021-07-30 14:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 64098fbe6e6b4ffb925462f524d27590 SHA-1: 7468a44ab51dd06e0f68baede270f52238eebc92 SHA-256: 954a7d8920dc5205a0bf520bcd4ed9e82e0e8ad6ab415d7f030b84c8e94c2eb2
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160778c40c4a42---6902830676.pdf In PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/mudumoxutedo.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/luzofefizafobuda.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r609et88t397sjcsg37l0btfs3/tezenuxozazudod.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/wamadelipozukuzagegunez.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021070817131154.pdfIn PDF document text
    • https://artbynela.com/uploads/file/14075940255.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/b9ous9t0ls75erj7ouqn6366ab/24382007899.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7a99c763555661612c8d017da114847b/19770806214.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9gb5tj974lrv8dnej8acfnodr3/51702296258.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/45a353c2ad2ed83ab9a7c2123528fec7/2191094724.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/bopabem.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/dinamilof.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/bixudonaz.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/mexevazezafawiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+you+play+pokemon+ultra+sun+on+nintendo+switchPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 11200 bytes
SHA-256: 2ef092226fc62e6eba2be6212c2fabcc3930a931ca00a981209ace958f521971
font_01_sfnt_off0000ee72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 17080 bytes
SHA-256: 1400cfa8cd92ebc68eae1e184d0fe5a56b931ac877dbd18e3338d8193cb47a3e

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