Malicious PDF — malware analysis report

Static analysis result for SHA-256 12b80cb544d7643e…

MALICIOUS

PDF

87.4 KB Created: 2021-07-28 00:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bae8f7f1f2f7df07459587509f312e1c SHA-1: f5a845518318275687eb40bc19c8498a5c6edb6a SHA-256: 12b80cb544d7643e4dcd2e71d1660eb89baf1d70bde770b885b08d4492c9393b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 pointing to potentially compromised WordPress upload storage, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66fa714508---72613128468.pdf In PDF document text
    • http://stardentalcare.org/userfiles/file/32834046013.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wojekanilarefitiwo.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/208793b3ac0b40b909e50be1f4cda7fe/xupupodokemepisu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/85962515256.pdfIn PDF document text
    • http://medipharmacompany.com/userfiles/files/75507693894.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160e07eb75a0b4---47675305384.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1233428---naxifavuxokujadab.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210715170330.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/98c36f23e06709c91fb0ee7c922b25c7/59162724187.pdfIn PDF document text
    • https://bamor.org/userfiles/file/44483080904.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070d66263b27---84889714448.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/r12lledpgg09kke2g52d463el2/67222681335.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6c1395fc---11130034056.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082575b795fa---28870173966.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/b5l1thidk0ficbsd6a0q8901jo/lazalanabame.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/19263943843.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867b543321b---79650945945.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/15978316380.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc125851f9e---89928111425.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ab62a5e35---zeropise.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/srhnktdq8cko26gdbhrqb7tj90/95141941237.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/ginoxoxudagidatelido.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/43468316063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+download+unisa+application+form+for+2021PDF 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_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 18040 bytes
SHA-256: 239343b7ce2c5c7b324b58cf86a9eb0ec5ed7157079ef18fd29e3c67518d2698
font_01_sfnt_off00011b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B99 11120 bytes
SHA-256: c9f792c41472568c478b4124f28e80c115f8d6829639e3edb2fcec1c55f57def
font_02_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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