Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf495ec16b9f381…

MALICIOUS

PDF

77.5 KB Created: 2021-09-08 21:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: d259b42731e0b2b504e6f3d1732c5243 SHA-1: c1efd54cf7dc3a2753d424dc44c30f02f25982f7 SHA-256: 8bf495ec16b9f3817dcde798890b72744fbc5f9bbb07981a3fb8561fa47fe93c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=have+you+been+to+jesus+sheet+music+pdf PDF link annotation
    • http://senesi-sklad.cz/userfiles/file/98561847498.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a6753cc---24518621865.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/31580377638.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/xugemumoxuxuxivimazuv.pdfIn PDF document text
    • http://didula.ru/img/file/debogawigizasarunirobiden.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/40612160175.pdfIn PDF document text
    • http://tamphuhiep.com/Images_upload/files/62482062388.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/jci4mnu5re7k00lj0n6st0hvou/xoposelaxozeveziwifasone.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/detere.pdfIn PDF document text
    • http://tdbm.vn/upload/files/64682519017.pdfIn PDF document text
    • https://btegypt.com/file/14795725154.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134cab49f238---71547955408.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/11782335633.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/25220793113.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/72490138251.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/kujalukufowofodavusome.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/53618568053.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/famonafemediwexave.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/352215631.pdfIn PDF document text
    • http://dfanchem.com/upload/files/livewizamixepalu.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109050017196691.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/kifokuvuven.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/79635202462.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/nufupegarusi.pdfIn PDF document text
    • 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_off0000c7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D5 18092 bytes
SHA-256: f1ae8359d72c1ab5454f79342a07a9e254c2a0e735a07e874c507321b9c6c80a
font_01_sfnt_off0000f5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EE 11280 bytes
SHA-256: 6035acbd10317c9aa7f59684ee1ac3859f3b807899704823471ac6b4295510c9
font_02_sfnt_off00010ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1