Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf02927db449967…

MALICIOUS

PDF

77.9 KB Created: 2021-09-19 07:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c84ac524e31bee5bb837c6a2d404849 SHA-1: 298f65eff0a616504755cd1ba8d32623582b4386 SHA-256: 2cf02927db4499679aa22b9116088daef148af1f562b31b1940b1f02b7190ab3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, aligning with phishing or SEO manipulation tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ietc-oman.saktoon.com/userfiles/files/bedapunisorevidolunifubi.pdf In PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/28545582299.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cb4cae41f---jakor.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/16883626100.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/8519435260.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/sipojexufawat.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/kumagatoxekukuru.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/2079203667.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/milederawetepurop.pdfIn PDF document text
    • http://ukrfirework.com/images/file/97719568883.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/sudifudipujolowafip.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/9308055270.pdfIn PDF document text
    • https://eclearusa.com/images/file/doropumumedorale.pdfIn PDF document text
    • https://susta.vn/userfiles/file/zabedabajugujesipe.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/palow.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/foxoroxabufi.pdfIn PDF document text
    • http://apothepharma.com/upload/files/lonifujazuxubufijune.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210910002315.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/97871792632.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///42283110281.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdc1a2069---voraxodur.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///86406590314.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614693a376cf6---jijogowazawegusidizu.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/zufatedovunetutikafat.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/nafop.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/vepipopeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=subway+surfers+mobile+apkPDF 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_off0000c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8A 10924 bytes
SHA-256: 3c8e01c36bdf7c7971f1dea6e5d69db27e2f9cca5a801ed77c2c401773ae8596
font_02_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 19704 bytes
SHA-256: 6b07c629dd67f84f8ae971a06635063047c717d998d90b17c67d595e8a444330