Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63e6a5b2cd64cfe…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 16:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c7a575f05f0b4656dcd85b150b485bc4 SHA-1: 076d50b99a1aa5d92d02e371916b71faef4b5d73 SHA-256: f63e6a5b2cd64cfeed97bae7915468e6b66e3df81583bf63b6a07534318f5e33
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document contains embedded JavaScript and numerous external links, many of which point to other PDF files hosted on compromised websites. The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further payloads. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=myxer+ringtones+for+android PDF link annotation
    • https://cuatudongbinhduong.net/uploads/files/15120102179.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/xosivodopetaveruzomaje.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/74948260178.pdfIn PDF document text
    • http://silver1979.com/upload/file/lobigedow.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/derijaxoto.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707196fa75---96371550709.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/46007214725.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wokujidarinonevuxivixitad.pdfIn PDF document text
    • http://elma1.ru/!upload/files/voduvafod.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/19072922332.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/64796443915.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/21930659427.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/gupojezimod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d804f2841a9c9d4b82dfe132dc8b554a/tiloresexekukepugeteberu.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/75111375244.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/nrrs1opav01q3fdogh996m1r69/77503571925.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/99777959809.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/12315447994.pdfIn PDF document text
    • http://amdind.com/userfiles/file/19570636236.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/23812855210.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/puniguzezip.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/xadajupugegubifefono.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/26865120343.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_off0000d4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AF 17128 bytes
SHA-256: c3b0dde583eb8b8aae827d41f5f7b3cee9d543220ff16284c0e8579322b3b8fa
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10692 bytes
SHA-256: eb008f0d090c41d56326e913f1af09f4ad3d5db42e17c161bf12d88dc2086fde
font_02_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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