Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdeee453628f09e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 16:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 20404e3697afbcc7bc44ce2d66654e9c SHA-1: 0a83914111f9644fd76224f7bbca85e04dbebe35 SHA-256: ecdeee453628f09e5fbd6bdc6ae3ecd2306a5b6dcdc39dda1a32da36c116555c
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mejew.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5bcccff99---49479882614.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8cc28b0f---xokejesasepugolojiz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/mk3t9ki8llrolgust0qvla4ol7/poxakiriwa.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/71176756213.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace72a0436b---bipelujijowiv.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/89661341171.pdfIn PDF document text
    • https://haidangpc.com/contents/files/72124666544.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/xenibafuma.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/43088520645.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/03c3cf46931300e3019d8851fe357e31/68275379587.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/ribegesasu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f67f75df4---82347361574.pdfIn PDF document text
    • http://mtegl.wsystem.sk/userfiles/files/21479666176.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/fikoxofadirogegurolupu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f68b556217---melegebusozevexigata.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210823171321_148950794.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/pimexuzewaravotubiva.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-2/20210902035222153497.pdfIn PDF document text
    • http://turatabor.hu/media/wedegulisizarojosabupafer.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac54bc54e1---58247108212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=embedded+c+pdf+basicsPDF 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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 16448 bytes
SHA-256: fe6f1014c3c3d8b499bf741b022e7591d04d1e33902bde834275629f9d5c05dc
font_01_sfnt_off0000fde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE7 10436 bytes
SHA-256: e6e5f935b7017c6f646f0316805b50773def429a637b3aaedb7de6c0a5c77505
font_02_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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