Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddeccefe1aa7be12…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2ef33e377c47e48b8702f12e3e33c6a SHA-1: 77d719bd6954949d74f45f6c8cff78d255fd9d13 SHA-256: ddeccefe1aa7be12756ec00ed49adbf79552d489d802736be60a341aac37b9a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, designed to act as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://wmu24.ru/media/file/8193577969.pdf In PDF document text
    • http://adhdesign.de/userContent/files/20210912010724-zevemigaxexife.pdfIn PDF document text
    • http://rjt1.org/upload/files/fudelakezul.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/82552633791.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/59285784860.pdfIn PDF document text
    • http://techbis.pl/files/file/85685600756.pdfIn PDF document text
    • https://brakos.it/file/72570867835.pdfIn PDF document text
    • http://infosierra.es/images/editor/dojimanamuvuvidagizapu.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/jiteponemifoworixej.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/54760945352.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/5758089306.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///88377782960.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/c8614bde6d8b30679391d389eae8b21e/92217410381.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/pehsc8etug47q73o85kt06pj9a/milag.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/modewupinazeboboje.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff95eb768d---65815733545.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/27013065534.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/90105765373.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/puvubonofaroratinuka.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/49453417723.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/55383777239.pdfIn PDF document text
    • https://digireg.it/upload/donuba.pdfIn PDF document text
    • http://henca.com/files/details/file/55649760578.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/61879464016.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/55251241918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=usaa+mobile+app+for+android+downloadPDF 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_off0000c4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F1 17588 bytes
SHA-256: 5471473c3b2e8ae0b4e79ecb963d05d4fa975b29279b9baabab6c0c0b08b98b3
font_01_sfnt_off0000f29a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 10792 bytes
SHA-256: 3b99573d07ac165ad6fd6abbec4628fd5c775e0516681b9864701bc51a8de06e
font_02_sfnt_off00010b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1