Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf955f39c48b1349…

MALICIOUS

PDF

73.5 KB Created: 2021-09-23 00:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 314bbddfe18831179f65988f34afd29a SHA-1: 67c0aa95d47797eec218a9bf43857619b254a390 SHA-256: cf955f39c48b13497843256dd83914bca8411aa1711a3b9ac05464dc4fed670c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=minecraft+pocket+edition+caves+and+cliffs+update PDF link annotation
    • http://home-hj.com/up_photo/file/ketotixik.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/begokiviputasufixixev.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/majojasujatozexa.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/sogefevomunesosam.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/20579359333.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/zixufinetomewijubuxuwurif.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/41617266478.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/polawezelemizi.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/42901200677.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5180a003ae0e7130316f90b6298d096b/94112653190.pdfIn PDF document text
    • http://splogservice.ru/content/files/kaxaj.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/55597660624.pdfIn PDF document text
    • http://shmgec.com/Uploadfiles/files/livosisekemu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161362ab8eeb44---wakigizojademexanow.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/3040925199.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202191775405633.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/ritilexefu.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145015529a74---numolurilinewupoba.pdfIn PDF document text
    • https://arerp.kr/data/file///famivowovitopiviw.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/83b3d5d07f62acf35a934e78d4bf34f0/tukapidawofu.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614994263c38a---tuwotilevozisim.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/garifetaxujipefiwim.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_off0000bbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBAB 10864 bytes
SHA-256: aea54f3f30b163ed16198c122cc6dc033f8d5672d3dc232e38d7d2bc17080aaf
font_01_sfnt_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16736 bytes
SHA-256: 1eba02855cbf0189966b0eac37de34a453ecaac87004d8ac019e83610fdb5c8b
font_02_sfnt_off00010025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1