Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb233fb683d0cc2d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 16:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3db3f4ccb9d76f34389a0b157fe3dc1 SHA-1: f81f382bf41172ec334788bc4ae0dc8717dfb9e7 SHA-256: bb233fb683d0cc2dbc2cb9514d3196f13e5cebd750b8dc1ebdcb3ca8b2774158
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://fwullong.com/upfiles/editor/files/6990754867.pdf In PDF document text
    • http://cityclick.it/userfiles/files/polobigux.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f93d4bc8e6f9b5244d819a273a2f209f/supugagupituniw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841ec5c67a5---93446300208.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/1j075b0lsu9bdmusuo1dgnuj43/juvux.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1625436355dosirinemexidosat.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/derafu.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/nenovi.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/pejanipuneriromabav.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbc12af6ba---61929017852.pdfIn PDF document text
    • https://alutat.com/data/file/jurajemabavo.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/c6ed4f701b7574e5584ade7ec26a9aaa/71621331729.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/68255572416.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/3ee3612c50d16abb752e6dc518f7b828/73383788016.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/zosemuropuzamovoxat.pdfIn PDF document text
    • http://iworking.vn/uploads/files/kevixosadojuvi.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/ec4e365cb1822523818be477d1e62615/lelitemobusidufekareto.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/turuwipajijajutino.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/63717870224.pdfIn PDF document text
    • http://medi-sen.com/files/files/nuwukudupe.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/77848952214.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/nibuwajitegapowonatam.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/95106402006.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/20612196856.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/70d1539fc6af0ec8131185f8cca57e9d/47807972.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/gagol.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608538787273c---23230554454.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=tcf+dap+entrainement+pdfPDF 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_off0000d777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD777 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 19248 bytes
SHA-256: c326d323d096f07a5eb0675137066477531f6ddb2f4fcc6b47a369f618063e20
font_02_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 10412 bytes
SHA-256: 5e4e1ecd6dbdf1dd4ede26fb97fa9017ddf1d02fac238bd31a9901a6eb2e8a5c

Open this report in the interactive analyzer, or submit your own file for analysis.