Malicious PDF — malware analysis report

Static analysis result for SHA-256 f023c316b004229a…

MALICIOUS

PDF

74.3 KB Created: 2021-09-19 08:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 737f3e6429781ed812e2860a2ae0c4a5 SHA-1: faea6fe97519aa3e4b3fdaf7826a35a3595c932e SHA-256: f023c316b004229a3239ba755a7084945c293de406ab79747f90ca8928b364f4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document's structure as a link farm suggests an attempt to obscure the ultimate destination or to leverage multiple compromised sites for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://artepcb.com/upload/files/81268789832.pdf In PDF document text
    • https://harley.dataroom.tw/upload/files/16928480845.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/96488380768.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/75503884038.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/80914567036.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/10951851770.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109152247238775.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/foxuji.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/79666638884.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419da5a4c64---jibezajapudiwux.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/lilejenim.pdfIn PDF document text
    • https://flomogroup.com/upload/files/debusowusigi.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///mirijoxavuravudoji.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/xadeboxitidotojuzelirasu.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/84282741952.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/loxuzimezatakazek.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/8194111662.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfc84cef8d---bewevipanubobuk.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-10/20210910003131443320.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161363ef6ebf0c---gevojowerakobawuj.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/40408801908.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/70203185793.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/seretave.pdfIn PDF document text
    • http://getvisa.ru/images/File/93218069646.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140a212b248c---kofufaxavaguwejowip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=word+that+starts+with+i+and+ends+with+iPDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/28277055414.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_off0000c069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC069 16932 bytes
SHA-256: 9e3391c2553da9b4609b090499498fa2a36ba084d1e5f3b3be29b49ea17fa3a2
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 10380 bytes
SHA-256: ad04b5d56f1a156ded6974c7982c757d4d2cddfc0df12529574dbac98756ddeb
font_02_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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