Malicious PDF — malware analysis report

Static analysis result for SHA-256 c565c7f2c8fbb020…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 12:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e9075737f096762c71a03d6c2b9d4de SHA-1: 71c82ec5969414533325bf1c533019da697a1bed SHA-256: c565c7f2c8fbb020d9ccba6b96fb91b29469c7ba9e3ddeca48c5e26a35d2e135
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The 'SE_INVOICE_LURE' heuristic further supports the phishing pretext, aiming to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://garglob.ru/uplcv?utm_term=gigalife+latest+apk PDF link annotation
    • https://triyoga-tv.ru/userfiles/file/46014241902.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/30506848795.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/25168014061.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/87735489325.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/nitad.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/19709221746.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fenelorexeludule.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0af40a2b---mefofowakigulepurab.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/37827603512.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/7982152351.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/pibuwixavorezuverujilak.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/45568717853.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/64900791619.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/25077621817.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/2c2c2ceaeeb85bd20170bd42e05d4384/sewobegezok.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/gabunarazamix.pdfIn PDF document text
    • http://mishelik.ru/userfiles/file/94252866001.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677e0c10fe---26354863036.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/fapemevufezazebomam.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/8487618297.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab860ee6f6---zikezivotaxanujukux.pdfIn PDF document text
    • http://sun-eko.eu/files/file/xujoputetekagini.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/nerotixajaselepogutaxire.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90ee3373---81027973358.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_off0000b969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB969 10340 bytes
SHA-256: 4e414915c32e67d75e2753ee858469ed5a5ed82dafd85231156dc1040284b2fe
font_01_sfnt_off0000d0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F0 15504 bytes
SHA-256: 5c8e2a45aa1fe4f8936be9deda5897b09b8ae937a9ef103851085bdfc5a9350e
font_02_sfnt_off0000f902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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