Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c51ab6858d7a964…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 11:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 995bc294e077f5e509e629b7193a3506 SHA-1: e7154125979873b517512d1f96ecba5245b407d6 SHA-256: 3c51ab6858d7a9647fa8aad61a1081baed5282fa4af7519abb06b7d9270fe18a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many hosted on compromised WordPress sites or disposable domains, designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. Although no scripts were directly extracted, the PDF structure and link farm suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lengthening-sldf.com/userfiles/file/tolosibavido.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/56990a1b518f99c2ba092a56e952addc/69768963796.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210913_32779C27DD87D886.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/gojenev.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/e6c983d0be42dec14e1340ca4823018c/werelemuvixeko.pdfIn PDF document text
    • https://biodez.lt/i/File/luwoxivumowajemipiribosat.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/98223945313.pdfIn PDF document text
    • https://csodamalom.hu/files/files/25353558760.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fajoninifob.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/tokarowaneximesewemevuna.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/63814564363.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/28891164475.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/tebazuwagupajiten.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/48386983646.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/14652332159.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/lerugosibonixazejaka.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49b21d9ef---39241622236.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/xomuvurodasevetov.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/botegoxav.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/biweromedepumowumud.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qccquuo93jbuqouqr3l9hui99d/nibidulixirozudugux.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4b45e16d---lukalona.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/60a025b4baef3e38f14031862aa9a592/bilofobaxorubivobufidesil.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9vjnu5ie8o7eb3emsij41qmh4/85857617385.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139c4959baac---norug.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/buzeduxupubobevagemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+racing+masterPDF 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_off0000d6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E2 10800 bytes
SHA-256: 21201c7902c20132504fa49aee0efdefeef1fe676547befb70ea9b1568e9cf00
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 17548 bytes
SHA-256: 38f705aa82f84e33968297544e8b0b8b37f7d67cbab6e49d8929ddce7075cb34
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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