Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7ec8002085e4b0…

MALICIOUS

PDF

81.4 KB Created: 2021-09-15 11:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3d57d7ec63b5c75e7d6a76ccc8e5d2f SHA-1: 5246e4b3994a151da5e82848674c2bfd96a95f90 SHA-256: ff7ec8002085e4b01b95f2b0029428ab1da1c5a2c988f3853ff8a8cc09172675
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of UTM parameters suggest a campaign to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://labellebeaute.com.hk/ckfinder/userfiles/files/xarupisabaneminuxazuzar.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/75998957651.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/acc2b44e14a6648f101dbff34244934d/77576786499.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/zalidofokegixapexob.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/dofopusiwiv.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/15277906735.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/15100208002.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/57469410085.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/88387057234.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bibav.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133b114be797---2315941235.pdfIn PDF document text
    • http://bankerz.in/qpic/files/30005722989.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/161300afcb9f4b---nanufibiwi.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/5298890062.pdfIn PDF document text
    • http://jonme.net/ckupload/files/nugokol.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/mesikebabesoxiz.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/rupuxajazizagakimufeku.pdfIn PDF document text
    • http://rinsacars.com/files/others/63242802081.pdfIn PDF document text
    • https://ozanetiket.com/TasarimAcarnet/serhali/upload/files/31057437530.pdfIn PDF document text
    • http://bavlas.lt/ckfinder/userfiles/files/ruwunemawevaralavitin.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219131559196537.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=please+root+my+phonePDF 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_off0000dacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACD 17612 bytes
SHA-256: ea87bf5a21585350f97a4d279f9d3dc3c30bff390be2d20c6bdd385bb2a71cc2
font_01_sfnt_off00010819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12030 10540 bytes
SHA-256: a790376e302779ad6717f9d871dc023ecbfaa66b8a1fbd3a10223762ff3466dd