Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb69badb4d2f297…

MALICIOUS

PDF

91.9 KB Created: 2021-09-20 06:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0bdb8ceb5dd937b8849b3f30f620641e SHA-1: 26a108b6b2e9271faa7b7db8e3023ee42cad0d80 SHA-256: cdb69badb4d2f2977f582173d74a82ce39df2282a560b6cf919202b81e44c273
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links.

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://ourcampuswindow.com/ckfinder/userfiles/files/54251308185.pdf In PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447cb7de52e---tozaledewazomik.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210916064839.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/73904974304.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109180236137423.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/jetoduweromosamazegika.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210906155835.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/12611534617.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lekudovuganibolama.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/50739600426.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/26630994071.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/30730336561.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/posigodesamibefuwomafitos.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/6770661626.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc8ee69e0---260211219.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/97173966274.pdfIn PDF document text
    • http://law885995.com/upload/fckimages/file/nerawibusoru.pdfIn PDF document text
    • https://alev.az/userfiles/file/zeguzesixawosuxokemavune.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/93762abea977f378b59350430c7f6c73/koxowaxi.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/5457892891.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/mp1k5n0dhveovp96q1d8beq06g/91652884886.pdfIn PDF document text
    • http://ccadl.com/files/20210920054742.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/62598255866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+can+i+control+my+phone+from+another+phonePDF 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_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 18380 bytes
SHA-256: f2255cb517505ed70271bf445c5c9d63e0999cbb9a890a33861eb23517709cac
font_02_sfnt_off000148d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D4 10768 bytes
SHA-256: f87fe8c6cf5805b28540260dbdc8cc8e1a3cdbcfa8b9460c78638184cac28490