Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4ecf307198e929…

MALICIOUS

PDF

85.6 KB Created: 2021-09-19 03:00:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c07d5b28fc24f1c580c8e2021cbad5bb SHA-1: 3ebb203d83ee36fa33df754730ba42154eeb76e2 SHA-256: 1c4ecf307198e92933b31ef947ad1b1fef6665cb15259919311688178432fbe4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://queure.ru/uplcv?utm_term=play+world+of+warcraft+on+android PDF link annotation
    • http://altus.pl/userfiles/file/33726515384.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/suzekabigerorikowi.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/3915119304.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f27712353---gijalifake.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/larakedi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3cd776b04---20895312411.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_135413.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/wizaxobazogalamunul.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bexivew.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/ponilax.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bawibexatiwowidirovedife.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jubukezixifapolokotagis.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/worojujuze.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/cb3a30546536615196beb23c0363f54f/fofolibemig.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/vimatu.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/fubagexemat.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210901_094716.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/pipobovajuxukovevori.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/9986435301.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d8c4ba43d44788878badb742868040bc/34331684923.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/sevukaxolufunasodasiwo.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/52053880489.pdfIn PDF document text
    • 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_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10368 bytes
SHA-256: cfd3f9686276aceb06255844c8a120a63ab01b6ecd9e94783b42c7efc44e7d34
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 18024 bytes
SHA-256: 1e9fe36c9f850ab5bd2159495fdb15ea9385e9207e004f8918c0969e05f412cf
font_02_sfnt_off000130ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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