Malicious PDF — malware analysis report

Static analysis result for SHA-256 cae0a63ed193440f…

MALICIOUS

PDF

94.4 KB Created: 2021-07-27 09:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e9d302299b2d8f66b0764bda7722656 SHA-1: b970e427ed5370027f9ea508328e806e5892886c SHA-256: cae0a63ed193440fb16a3bbbcd6e1783735506aff9d9012077e981ca9bdb1748
196 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to prompt the user to install a browser extension or update. This suggests an attempt to compromise the user's system or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://moolans.com/uploads/files/zuxesapokipawi.pdf In PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/wotude.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8c76fd4fb73ecc2f14b5be3337584b47/99844971440.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/643f7d1017174401440e553921abdf5c/53968136381.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d890a91278d---gowatizakagomezaj.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d14790991f3d2af0d894238b45e4ce5/wopakakojotilijofupasu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/brvssf07lej707t7hf0nn7unum/35881762596.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/5603432406.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/benukowok.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/98015898474.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/36154868103.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/b1ucsed93r1s9oqcvv8uqprm3a/75988338580.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dusopa.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/wijogotaxifikutebagerepal.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/38111676358.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/fekoxirixax.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/47403501212.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/14889169554.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702d2df39af---18936945591.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/82b87ng7o8l7jnkb35nhmbdod1/23088488329.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/47915170668.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/pakekotadoridanedo.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/kuxakibulunadizemobarome.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/92915136523.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1406035512609a592a0eaaf.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/74416781017.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/226e940eac5f14a0ff2f1fe6383e563e/60630183843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+reduce+the+size+of+pdf+less+than+100kbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C5 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_01_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 16608 bytes
SHA-256: a7f6a9d0fdb8a4bb49d9ef1fe5b1db361375e7bb46018440525e98d078a3c026
font_02_sfnt_off00013720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F37 11360 bytes
SHA-256: b827365b97b9905906744bfc52b55ef6edf9f2dbb241b6a24fd3fb58f7fb8b11