Malicious PDF — malware analysis report

Static analysis result for SHA-256 764481c3be586691…

MALICIOUS

PDF

68.9 KB Created: 2021-09-13 23:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ffb72b24fce39217cde7556168bf9c9 SHA-1: 574e169807dbc0d87c890a4b124e85866062be60 SHA-256: 764481c3be58669154ce2f89f75e688bedcd2b93a9a2b224b628a479ba012ec4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous potentially compromised websites hosted on disposable domains. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314ce82248e---zuwosiw.pdf In PDF document text
    • http://bankerz.in/qpic/files/41946922121.pdfIn PDF document text
    • http://wych123.com/upload/files/66184771376.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/73197354979.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4df7a08ca---21714606181.pdfIn PDF document text
    • http://w-mill.jp/images/file/62114219899.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/72602258785.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/40246047637.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c2530ccc51f9ccc2cd77350dd73d7843/tuxapezevivirupalirolew.pdfIn PDF document text
    • http://elpijisystem.com/file/bakuwuxotirerawibi.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/3996614546.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xefibizerulu.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/hvoqee7quvo82vkc96uicil44f/4760893586.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/78117770479.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/78273758259.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/gesakofopirulu.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/kudogekuvupinu.pdfIn PDF document text
    • https://pr-dienst.ch/file/27993435480.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/fiwizofowilozeduxu.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/kadugifowafew.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/71745598716.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/18809032351.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85134624438.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/pevijolidoxili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+games+gun+gamesPDF 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_off0000b26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA82 10172 bytes
SHA-256: 025682bd6a69dffce4e7d744d9ba3f83540ca91cdd289b48214714dc0a853099
font_02_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 14660 bytes
SHA-256: 35a2469d4f7f84aad376fe67174980a54bc44c9cd3d7671885fcdaf9cf1157e0