Malicious PDF — malware analysis report

Static analysis result for SHA-256 828f00def13ea39f…

MALICIOUS

PDF

71.7 KB Created: 2021-09-06 08:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bee8e9e8105368580e3f58a4c83138f3 SHA-1: 615d6f23c8851c877cbd2d41ae787dff839dc3f0 SHA-256: 828f00def13ea39fc8c2bf39677f0ea01210e5f0381b322cd16ba81b2901015d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to other PDFs hosted on compromised websites or disposable domains. The primary attack pattern observed is the distribution of malicious links, likely intended to lead users to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/ed4bca8be915ce621e9379bd7792a77f/81008285242.pdf In PDF document text
    • http://3q1p.com/upload/file/210612094859197252gfax3w8zxf7z.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9143f44f---pibepo.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/tezefusorefi.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/39181572805.pdfIn PDF document text
    • http://1careglobal.com/upload/files/53166175459.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/49447119846.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/82918669167.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/29193f6cafaa3cfe8dc871a25bc297ec/89057244174.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8444893c5---67931711704.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090105114973499.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/fazaxisaruwopalulixon.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/lidobusiruw.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/zorifowiviwafoligulage.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/6535228296.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16071733fd2746---84111094843.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/lekevuxisazaragapilutudi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea35dcc3d---rirotul.pdfIn PDF document text
    • http://fygl.net/uploads/file/01194600583.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2b6ab8a6dfdde795b71d501f720646e9/japanuwuzitabebajovami.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/56865868035.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/273df53a4d4fbede9944ff0748dda969/detipobeganamazifumofuba.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f2727a27c---teges.pdfIn PDF document text
    • http://hydrem.ru/images/file/91911180989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+de+maquina+de+escribir+electrica+brother+ml+300PDF 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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 15452 bytes
SHA-256: e5b7aa47e345ed7595e8daa97444212a03dee950a18999f6bcb4bff5bb569934
font_01_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 11308 bytes
SHA-256: 89235eedb3c0862a9080177703c2526f1e989e81a3dfa94e640ff45fbac7773b

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