Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8003c0d62a65533…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 23:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3550cb4d8183b969d7ccdd4cfdcfe026 SHA-1: 39fd200952f39e0745d76fef14e6b08737f92df6 SHA-256: e8003c0d62a6553382e2dd1c95e8727c76fa94cd06aada5792fbd15affe5ab19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation or tracking user acquisition. No scripts were extracted, but the structure indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://catamma.ru/uplcv?utm_term=how+to+get+contacts+from+icloud+to+android PDF link annotation
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/184465d4e8a69a3f599824cbc56e50ff/bipoxasaroxedemotep.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210914173708.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/doredujabumapexokima.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/povifane.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/17449041489.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tunasaridejivodoxoxujavi.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/waludog.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/kdj03jc6j3k0jq2kupnrabcsi4/niwibijijar.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/5771949334.pdfIn PDF document text
    • https://goldgreiner.de/userfiles/file/71751315696.pdfIn PDF document text
    • http://minhanh.com/files/99361692711.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/97323399132.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/regazizeviwikitil.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/e9028c1f652fb76e52be24076b8a3c27/8398210663.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/15192345123.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/metatamiz.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/jojinagazopusab.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/68108754455.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/37658968059.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/gekaxejok.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140a6cf3eb33---lerujo.pdfIn PDF document text
    • http://nktrading.qa/file/files/ribanufemasoxizaf.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/35216280639.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/88132629690.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/79333600938.pdfIn PDF document text
    • https://shinaltd.ru/images/file/remewa.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109161629392284.pdfIn PDF document text
    • 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_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 17168 bytes
SHA-256: f384b23f89a5e20ac5c7baa78ffe6b438ee5278d61aca1b29859914c72242d30
font_01_sfnt_off00010940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12157 10996 bytes
SHA-256: 5d0f0d51f5d699abe3b683207b23435866fbd4d298db29ee0e0a6c6c5c42eb2f

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