Malicious PDF — malware analysis report

Static analysis result for SHA-256 28121dbffde04126…

MALICIOUS

PDF

79.6 KB Created: 2021-07-31 08:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cbb820711b955b8058c5af5abf0a0d09 SHA-1: 3af671578f6d084ee06c08054bd54e0ec70ac220 SHA-256: 28121dbffde04126d2f30f80ad672220f05d111640ce18043b0972e6f4d7c21a
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple websites, some of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9080

Heuristics 5

  • 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
  • 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://share-world.tw/userfiles/file/19158090120.pdf In PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160872be3d6502---6247824839.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/navafetedureda.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/7861525184.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/mupedaresixujimoxegu.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/941775935.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4bdf7c8af---93110062694.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/57a7896bd6f2b9bb334e49a4d38eb6b1/zivazavidovosesipudov.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/samopenusozuz.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/baa267725364795aa389d92f3a354578/wavakolesatek.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/xekazodisojitiji.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/83619569269.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jatupiwojigiv.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nutezi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160905812e56ea---60476101944.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/12fcd1644d5abd378568682ee235008a/rugusiwafure.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/9f9b414543db7a292cf3ddd35b5994ab/56615780212.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/sisurevi.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/29541085320.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160d95376ab9af---liginisiruwirawomipi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/16671344356.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d157666b6---pudexizozog.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6876ae394---26914431078.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160786938bd519---68624604492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=180s+bluetooth+ear+warmers+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 17692 bytes
SHA-256: fdd032f76537583187f130aca753d1996f6f2c5ff53837373d1270be33f61ad1
font_01_sfnt_off0001268a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1