Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6a39a4370e7db7…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 04:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85256935c2e8e83031a7cb949f7a96bc SHA-1: b06aec780296e6484c1bbb5c4fdfeb37cd35bf23 SHA-256: db6a39a4370e7db78c3389135095c9efe89683abe3a8a7f20be2563e7ee15c6a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a PDF link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards exploitation of vulnerabilities or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fd19a5a8---51766265329.pdf In PDF document text
    • http://antichigelsi.it/userfiles/files/wijuvitede.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c1fd9e428---42363713571.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/pewofelewosazodawakivenep.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/ab436502f56f7b681236625324b999d1/955948744.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/fenasigojisuj.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/63945381328.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/noxifemepitemowasisewun.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/uvel890vvp4pue5sspuiov0db3/3404726403.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/xefiweti.pdfIn PDF document text
    • http://sparkpro.lv/content/file/89922178473.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/um9p4lcggak8chdf0h8f8613i4/49383015344.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/tosizamujeg.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/87288254243.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160908eef290f8---37424967193.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/5301692576.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/rudujejogolodu.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/fobalolozubu.pdfIn PDF document text
    • http://nature-revive.org/files/file/fusar.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081874f2d34c---wofebolosatimowodogawiz.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28edf60229---28746072889.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/70899934866.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/40378489973.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=como+escribir+en+un+documento+pdfPDF 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_off0000df3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 19172 bytes
SHA-256: fb6ef7efc177c22620adcb41a3aa931191048c6b38bc598e39a5f261225f57cb
font_02_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 10844 bytes
SHA-256: b2f8b91a1cf474d41f1c739ad0e29d1cd0ee55f586a929805ef5c2d16324cb4d

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