Malicious PDF — malware analysis report

Static analysis result for SHA-256 2759e4aefb79be67…

MALICIOUS

PDF

76.5 KB Created: 2021-09-10 07:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5958621b15731f700f8a5c1c1ba63c5b SHA-1: 7f1944856c6f85c8bad9ca0563820ec7650b6025 SHA-256: 2759e4aefb79be67bb04c9f13298a813d44d2681b9e918df6e038af133c1b01f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/uplcv?utm_term=duplex+play+android+apk PDF link annotation
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383a5f1e252---38315839805.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19e72397---900832714.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/78617988486.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613476cb4b1f4---86263040389.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/rajasutizeranafaguvoj.pdfIn PDF document text
    • https://businesslife.com/content/file/26597429630.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/68289669354.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/42030608657.pdfIn PDF document text
    • http://simonide.org/userfiles/file/33922021152.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/34935969889.pdfIn PDF document text
    • https://bak.vn/upload/files/mumoxetolakom.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/sovolajeguzakofojav.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/wexofebimipanep.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/papinorimefumurizazaz.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/bawokotisa.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/15544312002.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/28319441084.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/30606634188.pdfIn PDF document text
    • https://anakmeong.com/contents/files/6785524204.pdfIn PDF document text
    • http://xsteelstock.com/d/files/1036870917.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/jagivigisarevusukem.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5be831de1e9349068d736ab092b0c4b6/didosafolovadedakivegota.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/zoperesir.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/xuximeveso.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/fadolasuxolizofibu.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_off0000c518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC518 17972 bytes
SHA-256: 4ca78410003e5a5cca7072cdcc7b91e73b29daab35e38cf02dae8ced8b247fcb
font_01_sfnt_off0000f3d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF0 10528 bytes
SHA-256: b0f144be8d8afea49c6ce5215d90330154c3f1557a4a5a12aa4494b5e38d76ca

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