Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac833194f46829b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c1a4e4ad6846777422219aeeaad90ef9 SHA-1: 8d5c93c36c6313cf087f2ee0a7e8d8eb54eb5854 SHA-256: 3ac833194f46829bab3c8eb1ca9df25ee2ad6c6822b153346bea8d1045cd7fa4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs, many of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://usairsprings.com/userfiles/file/rotodozakidesa.pdf In PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4d1ce65794dae6e2635315b64ad301d2/93309723869.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa4e8a7cf---94843771065.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/037aa0f683fe60587c1464ccfe9c26b0/nepibaw.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/77c2830228305fa0d03df4dfe74282a5/44898965656.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/4742110803.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/36e4bbc3a4c33675391865d72b357890/nariro.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/94953587666.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80773096158.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/ruxija.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/venokasirowenolajetis.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/totatinu.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021931449123695.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210907235738_gy6g1e.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/kemofuje.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/wumawenoketixojero.pdfIn PDF document text
    • http://guowangcable.com/d/files/35922821717.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/kufubufobokeviran.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/98122245191.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a3dade5d6053e8f17d8d993b63c0175e/66911130121.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/dufawuvenub.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/juzanumizu.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/15306590109.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ef8a39da---xedekagubogejatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=vidmate+apk+laptop+downloadPDF 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_off0000e11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11A 17844 bytes
SHA-256: b0f0d6df6929296553a1518ba8c118d907c22fdfa584a890f5c080efe7e201dd
font_01_sfnt_off00010f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F36 10432 bytes
SHA-256: a06bcedd1c67850f57f4cabe7c9bfa9bb4b809d60b42649165f00b1d9e1a5745
font_02_sfnt_off000126d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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