Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91e15701acbf5de…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 13:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 570fb8343e16e28b646af53782340f9a SHA-1: e6e54312d64922dae85b6de6bee6dd542fface3d SHA-256: e91e15701acbf5de088e9551e4dc8da3955e40379fe472e3e7c77c78683c0859
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://pixomot.ru/uplcv?utm_term=dale+carnegie+free+pdf PDF link annotation
    • http://hondatayho.vn/images/ckeditor/files/riwar.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3be20a798e21be378bdedd31e0ebd5d8/31249782776.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1728c598---65317620778.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16142176e63a60---gotevudonotudabob.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/61503203998.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/nadob.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/mekunodivesonegi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/22446971443.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/65535949358.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/27367427563.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090302110373499.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/fuwobujiz.pdfIn PDF document text
    • http://195exim.com/datas/files/91096077763.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/pujuraf.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/41708909840.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wuvigejajotux.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/zogubufob.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/lixagusedilo.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/lipuvetodigunifazoxewe.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/161428a37e01b6---furiraruzulowofuxanokoji.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/wajeb.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/bukemo.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/23996718862.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/51a87221599e9f047aadbe5d54c4a171/58596830148.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/57068969299.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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 10412 bytes
SHA-256: 35b359629d44c1bd210798f375d47b63e2c2f61f79858df69763f13e3e55691d
font_02_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 17820 bytes
SHA-256: cf6b8297b6682925ff596a34ab8325cc4f8853edad487fe525af6489aa00d12f

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