Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a92a2e118490eb…

MALICIOUS

PDF

86.2 KB Created: 2021-08-03 02:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 716dc800a9921b99b6eceb541e7061fd SHA-1: a2a04a2a1f8178a1e6fbcf3cce8b2157fd16a9ef SHA-256: a9a92a2e118490eb217032a54d1113ef912bfcc6c9880c805c8e5b6e6ace7ae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is intended to deceive users into clicking these links, likely for phishing or malware distribution. Although no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://cintabogor.com/Uploads/userfiles/files/xaxapolutaxi.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7f87b8210b00e786ebbc930e42d8c56f/79857138061.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/vovitegatuzusunazatasuvof.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607030986e3bf---watojugapexakup.pdfIn PDF document text
    • https://media-get.com/userfiles/files/pijolerezaxagulorex.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f055a5e880---jivobujipodekupu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa87616a95a---6875161490.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/gemuzufigesejus.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/mudexejugasiliziramofig.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/979d3d8eb5dc8d54873f30c4aea62ad6/vuwagufu.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/barowunodanerivixejewuwo.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/selepoxodidaxezatidope.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/muxuzaregol.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/fefomomibibetosuvule.pdfIn PDF document text
    • https://petek.biz/resimler/files/sulidovapebog.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/73728574917.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/tuxir.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec160e0e6f---zokajimopakako.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/nexovijugafanoxukali.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/68019595021.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a842bc5ff9f---64441776478.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nfkqsg1h7eq3ch8uvjdgcn5o23/52395708950.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/db73c3bfac3aee3e822684834bb2d702/juzumijono.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a02cf71f23241ac7a8e527f8c7f813aa/81044317106.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8eb460b09---pijumaterejobolesowopob.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf8cadde3---ribat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+the+duties+of+a+finance+managerPDF 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10972 bytes
SHA-256: c27b424173bd08381d6bfa3b8b7fd55554443d36a4ac7818c3008002f6d799c4
font_01_sfnt_off0001094b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 16184 bytes
SHA-256: 618c71262a8a303c4c5c3330b7ef3efd540d404ef60c36322f6be7239338ac24

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