Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bec81b6ee97bfdc…

MALICIOUS

PDF

77.9 KB Created: 2021-09-23 12:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ecabde2fe6c928e7764ce327fcf8118 SHA-1: eea8f7e9c936d2d3e6a44fb71963db1e1e2a5096 SHA-256: 9bec81b6ee97bfdcc0adb47c3013c28a12f6351240a8f3a97627518603f724b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to obscure the true malicious destination by using intermediary or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://crewmak.ru/uplcv?utm_term=free+android+data+eraser+software PDF link annotation
    • http://jjkxmy.com/upload/files/202109131600451346.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1614b002787ca3---55655759445.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/biseduxofulofotasajogen.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/56148795989.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/naviza.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/90164569661.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/98042306316.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/80572802422.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/veribevakokamibobil.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/2902313728.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/surasuvizesetu.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/zekupogeniwesefosirujax.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/45386914573.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/8357686158.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/81153128296.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/d490d475c6af00c7cf8e1bf337b274fe/81900621914.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/36271993091.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210913074718881615.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613455066e9d0---30192865348.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614adf2fb623d---telademar.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3bd212d61---86914354779.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kagevasolakekunegak.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/gafiluduxuwutola.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_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 17560 bytes
SHA-256: 6b2939d327bbb0ceb536dca22ddb48ddf76327f08687e712d1cdf22ad4bfc373
font_01_sfnt_off0000f897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF897 10364 bytes
SHA-256: 8a347c5dc2a719030034b81c1a37bddb4647bce3ab6307a70c2bcf9ba5286cc6
font_02_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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