Malicious PDF — malware analysis report

Static analysis result for SHA-256 201d28766cce75e6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-10 16:33:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5b2e1e37e66a464b64dc5ceb659dac48 SHA-1: cf86e2be2db05c9c6b2d6a4236bbf5680f6f2319 SHA-256: 201d28766cce75e6f674559b18a062d40105fb3f27594f3cc33a57c3b3bafe34
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://wastran.ru/uplcv?utm_term=peter+rabbit+2+on+tv PDF link annotation
    • http://sevimticaret.net/userfiles/file/72611529435.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/mowamal.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b12f1ae0---xuweterigatefasofikadebo.pdfIn PDF document text
    • http://precisao.net/files/files/netenija.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99408ec59---xulowobisilomowalipozedal.pdfIn PDF document text
    • http://bronnicy.inhome360.ru/admin/ckfinder/userfiles/files/redexiruloduxeg.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/86064384770.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/67559137234.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/28891780902.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/70778681683.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/bapugekulunujesoro.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/30015160224.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/fifusodugatipemelazotel.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/51213463332.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/pejaxifafegep.pdfIn PDF document text
    • http://simonide.org/userfiles/file/lexujukizenumudo.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/kosozufugiji.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/sonafatuwi.pdfIn PDF document text
    • https://icbacademy.com/upload/files/76383618235.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/71922251733.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/welixumezevavuroroleralot.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/89580139030.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136b31b6466b---figilimuku.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_off0000b36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB36F 16664 bytes
SHA-256: 9124b08bd2bf1fae3623130f7a184aebdefacedc03fca84b9dbf971d9645d5ed
font_01_sfnt_off0000de7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7A 10212 bytes
SHA-256: 8a07b7671aeb0d4a85efacff51b48605ae4b9d6beeb2ec87189933d0ede5304e
font_02_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1