Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5da495deebb87c7…

MALICIOUS

PDF

85.5 KB Created: 2021-08-20 19:59:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a1450c5aec20d4401536cecdc9a193b SHA-1: 6106915d09fbe568a6c1dffd049e42f44dc835f9 SHA-256: d5da495deebb87c76adf42b6a7af3fe7805cbff88f175ff6694887ae7fe18d7e
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm or SEO poisoning tactic to distribute malware. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://crysiq.ru/uplcv?utm_term=highway+cargo+truck+transport+simulator+mod+apk PDF link annotation
    • http://dragonera.cn/admin/userfiles/file/75948794668.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/30288511120.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b762db2a19---23665227019.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/02892beeafe8e5496f94d92226f972ec/duzisimawibijabekogusi.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/ropex.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/sufagudunonukasoxa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1354ddffd---muloxopoz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e4ffc032db67eec100011149a6fed2a3/zixezowafufenimibijujedi.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18766170430.pdfIn PDF document text
    • http://tonitomov.com/picture/file/73002614935.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/papitejotepad.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/s729pha99thjsi1cvuue7jufjk/gonasizutoxominunat.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/bazurimuwegalunizu.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/sutovamavafilatuwolo.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/lilix.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16080f3bc59721---biduzaxizokeduninuri.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/359e30e2a3702a2768ec93432f8b490c/memetakirusujoponor.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/oesv1064jnk8pj1pm97qeggoil/19645560234.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/zilatetexotunusalosinefen.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/88710242830.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/62192130744.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/28945309101.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/21badb229379c4e3d62d459b939a99ff/92915228344.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kq7rsca0cs87gfl54vgth03811/zekudu.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_off0000e6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CC 11212 bytes
SHA-256: ce9ca837309c47cba1d1cded03160252f97dfdb64422d0af37fc9a522fec0d9e
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C9 16904 bytes
SHA-256: f85275bf9b0a3984496a2cfde1b01a51feb4c62a82f67c9747bdc4df84077f5e