Malicious PDF — malware analysis report

Static analysis result for SHA-256 837a06e22a45bd64…

MALICIOUS

PDF

92.3 KB Created: 2021-09-15 09:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: accaaf365615607dfcca275b837f81c8 SHA-1: 1495f74cb094fc820407bc8a68ee516bc8b6e0c4 SHA-256: 837a06e22a45bd6467cf17d5e073757d45e99788fac749815f0a525a2846def0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://crewmak.ru/uplcv?utm_term=new+peter+rabbit+movie+release+date PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141394b11dac---wobalulepowinew.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/19078323087.pdfIn PDF document text
    • http://llux.vn/uploads/files/jadekasojudunobewawovo.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/9947e7d2b2cc9c4d630b8567b63449c7.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141397512cdb---17730221323.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-14/20210914055932568642.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/21507470340.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pt1cudkqb2e1c2t0pah37jfjnf/9342389284.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/4053051456.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/nerupefivuxideta.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136db75ddff6---sutasatiminimuvigevizu.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/54473028019.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/guvosatesunuxavije.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/zidijevoxudurivoneval.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/60603886017.pdfIn PDF document text
    • http://hobbes-group.com/upload/files/85857308212.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/wasalelepopojuwajix.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3b23865---40333521758.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/rugiwu.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/50168298683.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/fikakefiv.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161383937323d2---59768846000.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311439243283.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_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 18756 bytes
SHA-256: 63a7d4e134746771cb2574cb37d466c4621b159170b67b25095cc72ce18989ab
font_02_sfnt_off00014a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7B 10716 bytes
SHA-256: e8b43b57e24268048ab0c6cb0e75a248704e5727b3095a42cf168d829a8e6f96

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