Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba8d158f318b9a9e…

MALICIOUS

PDF

100.3 KB Created: 2021-06-24 19:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9061756a4bb72baac6a1facc2d0656b8 SHA-1: c03d00b857d96a9ae51fe3e288029e1d6c40383e SHA-256: ba8d158f318b9a9e2d6667b688bb038241dec42458d3149078996aee7232a226
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to trick users into downloading further malicious content. The presence of external URIs and a link farm indicates a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://davaocarrental.com/images/file/peraf.pdf In PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083f9196c2c5---barubefis.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/dopevezijoxejoxixezak.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/o92boij0cpnsvloq0fh1jat1p1/toxanesikefapizubugosa.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/liren.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n4rh5a2oln5opci9b0e3k78455/fakavimu.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/ginovox.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160978725884f9---65111734580.pdfIn PDF document text
    • http://puppies-4u.com/clients/e/e7/e7f09595da74c05d2059c741134300d2/File/dagisugurazumo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090aac043454---risejagadege.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ba8bbc94e26b14108a639634146b45d6/65068206711.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/34482388991.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/bokafusebalunanalugi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2285bc92f806363020ca8887d19971a7/10670460048.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6f76c16beafa23a0d3707e850653319f/fakojujazekebetilubef.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160780f6b59d9e---nevotivojudorapi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=vlatko+vedral+decoding+reality+pdfPDF 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://scripts.sil.org/OFLIn 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_off000100ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100ED 16644 bytes
SHA-256: f589b486810bff475072b9638cb00fd5cc606d2d3d165c4c84b50f2610ac5b24
font_01_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 5336 bytes
SHA-256: 7e3d66c1350605b0d56f1417e77f06255d7e7d809ae8abb663643ecf05295c8f
font_02_sfnt_off00014857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14857 11240 bytes
SHA-256: 67803994a8d020087d7a2a4c7fddb3f710f1b84768291e2b7b0365b26be45bff
font_03_sfnt_off00016e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8E 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd