Malicious PDF — malware analysis report

Static analysis result for SHA-256 101b6e5402ee209f…

MALICIOUS

PDF

89.6 KB Created: 2021-07-14 01:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d7c690a51d6679a25da6d652063c2cd4 SHA-1: d18f4418e187f5e33b476f4758993cadca03db6c SHA-256: 101b6e5402ee209faadf5200bf5cf4ebb6943fe463d5367e1b1abbea26315137
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=on+car+battery+is+red+positive PDF link annotation
    • http://changwontour.kr/FileData/ckfinder/files/20210610_9991BBA503F58AAF.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/62222228205.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210627160908_Z2VidXJvam9yb3BvYmVwb3dldGl4YQ==.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/gurulisinazedowanizopasu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0b060d6---muzuvopilanaxu.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/19932579245.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aea0e499481---gadakufozo.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/35007680861.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/51938783246.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045024750f---tosovazetisomadopovebisex.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/xabagesexivimojig.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99af889efb---12835587485.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/9mdib24jeh7ijacjsqgn37jfv4/80036390243.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/6juqn3ulka489tkh5u6vdg6bjs/45352788916.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mufovajafiwowiv.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/90791090828.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0aaeb254fe9f79614b7c0fcdcab21004/97167416977.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ot3vr4f52kuollrg7jn3u1dfkp/98905574610.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/gadavew.pdfIn PDF document text
    • https://laps.pl/userfiles/file/xifuxos.pdfIn PDF document text
    • http://griby.biz/ckfinder/userfiles/files/66542820173.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/v07te3jjr85nhm132rhf4729ub/zepusajelodobusirixanibez.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_off0000fc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3F 10804 bytes
SHA-256: 6c39ed3ff3fa797c90acc8ff90003f6fe59ac563e9b96bbb5f766b50da1181b2
font_01_sfnt_off0001152d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152D 16848 bytes
SHA-256: 3a1bc76902ba4ea1e524d085b8684694bed49f9ce40e7e4ecad3aa655d12a78e
font_02_sfnt_off00014146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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