Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed646979b51bea5…

MALICIOUS

PDF

82.0 KB Created: 2021-08-09 13:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 89030818ea920358c2f2346dc6c70e1b SHA-1: da2e83254f92f9f28d16c022aca8524f31570ad6 SHA-256: fed646979b51bea55d171d920716f1920594023bc7dd2112a22717149c9c063c
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting PDF files. These links likely serve as a lure to download further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7s8kdh0mevfnfgj8m2r535tvpn/nekovubituponumutiropij.pdf In PDF document text
    • http://improntediteatro.it/userfiles/files/8540412101.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/h278d7r0dv9djbhd56uufjbaps/38651601499.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8ef642443732543091fbf4f8a5df677c/sodofewininuburesewu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2ab9a5567702046872c348da51558f83/sojojurivobivug.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16089db3e5d4ab---roxiga.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/doweduzox.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb289eb1b49---27409083081.pdfIn PDF document text
    • https://nada70.org/userfiles/file/makezukojivisuwidus.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/31326031594.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/wefanidupali.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fae3b692923---83423201457.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/33589483638.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/gakesalezabi.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/69642575385.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/fb374451a3a8bca680364cc316983e71/25381158870.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/sejupomisafol.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160ab16d49a90a---59428938320.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/fadoximutume.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16076d2713c0db---sirubidevijirot.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/pikubiwufiw.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/lisuj.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/9c2cef309ef73a8c14ce5453d24a0d31/puzonuzubularofabofi.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f5621783c389428d6993f02bd804dc02/13624817359.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/naxumisasi.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/qsonkll49h7dcrcnaeiutak2u2/zekopavivurukare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=codigos+de+zombie+attack+roblox+2020PDF 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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 19404 bytes
SHA-256: bc8bd12be3f98c2ae7fcd2d1ec019ef7c75fd8490be5a0820ea01d62d7f5c5a7
font_01_sfnt_off000107b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B4 11276 bytes
SHA-256: 6c12b73e545a281e5baf8963afb162940cf3c52165bff819c9a257e19cf72d64
font_02_sfnt_off0001221f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1