Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d98747de5ce92a…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 19:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 835f800c79ff7966545054f35fdf8f86 SHA-1: bfe861f13a3c80b87efd928cde9ab1dd3d3b8e4d SHA-256: 35d98747de5ce92a8b4e27f5d5b6b1f11e7824a2b5db2e65898d550477a246b8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as a phishing lure due to its image-heavy content and embedded links, a common tactic to trick users into clicking malicious URLs. The heuristics indicate it's designed as a link farm, pointing to multiple compromised CMS uploads and disposable hosting sites. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's intended to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://aqua4you.hu/userfiles/file/89898092768.pdf In PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/vazokipuvet.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/88354831360.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ee8e3adda---lovubiramukaru.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/dafegugu.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7f2571008---ganazediriruvuxelak.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/xewuzazodejekip.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/90798210904.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/87059613335.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/83536926529.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/bigilosipegeg.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210926_232225.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/62303858341.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fefor.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/wuxogela.pdfIn PDF document text
    • https://profesa.net/userFilesfile/norufepojugajadumasowegor.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/sozenilasoruliwaga.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/54397379239.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/22053923475.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1f047a67---70665406482.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/1781e905b5f92e3d70a8a36a878d1e1e/71038185902.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/74916496955.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/kezavotimilozigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=top+android+games+not+on+play+storePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB245 10812 bytes
SHA-256: 3c59c46e0b5e172f7bbb8eb5aa363720f0d14be3ba778c687d8eaf94e131083c
font_01_sfnt_off0000cafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30D 14456 bytes
SHA-256: d4804c96344cae1b99f65c2047e85a356cab730e9daeec79347b53edb02bc56c

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