Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95bb08da652e747…

MALICIOUS

PDF

88.5 KB Created: 2021-07-15 13:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 79e06f4853fca489ca69a23f6ebc4552 SHA-1: 58f7362384b4e8c2424b01b4a61fb4301ebcb056 SHA-256: d95bb08da652e7475525f969be02a3df56cee263f73f33e89e36dc9d23919835
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3038eb30---26229107264.pdf In PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/556f96329fd3235a1005eebd5c3b5f22/xababerigawaxulu.pdfIn PDF document text
    • http://sns.hu/_user/file/48205589107.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb7c61e5cd---sezajavamufupulonojul.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc848564d3a---kawixonilevixi.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210705_221348.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/tugepet.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd0d49b1af---bexumasofofu.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/xodasejemiwowufexulubija.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/i89faekckrjm766cnfogfqccns/66443230435.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86d7c10ed---vokunowovunipuvofola.pdfIn PDF document text
    • http://htwy.com/upload/file/wizarovatutigis.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/towulejitusakowevajevev.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/g6hapk0b20qmhiudf7f0r4vs87/40973775074.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/480fd77c744b0a5820e9c6440aba10aa/17185221859.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8438be5bd0---pajifilu.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/wibopidura.pdfIn PDF document text
    • http://nhs1966reunion.com/clients/1/1c/1ca8f1639ee69cd7806809ed3bcda9bb/File/79753321896.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/19f2m3ikoc82l7no1252o8bug0/39334482750.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/lt9kcvn63bgl3mvr0ouv3srftr/96464443519.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/33f48a8e6ec13bf4bd01071bf681c68f/fiwuxesopumatob.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/84277263180.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/27250034617.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7e9089d8l79fc6fql0175aa0h6/96160975802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=earth+and+fire+songPDF 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_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10568 bytes
SHA-256: fa8675b3ebba907c2b00e0f8660340117b34ff80b624f47ef733f1389a1b9ce8
font_01_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 17360 bytes
SHA-256: 3d3264d55266d1d323e00bd29de20c4622a21c380c172c860cca46728bbdca6b