Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f967714cd595e5…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 14:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d339dd9500d8e6b59b340c538f20f225 SHA-1: e965ae831743b73d2199d22ec08ee0980efc7890 SHA-256: a3f967714cd595e5ee460cf9302a71c4e75f897e8549f30629ccb460c77a9975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 pointing to potentially compromised websites and disposable hosting, likely intended to lure users to phishing sites or download further malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://philabc.ru/uplcv?utm_term=stickman+party+1234+player+games+free+mod+apk PDF link annotation
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373917c4468---27980152927.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210912221816.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/94560653703.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/76300776110.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/senegoja.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/48744023183.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece79691b4---bemozelusosujosokalogun.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16130e141a34f6---63774333102.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/xedelizubokefipezabegubij.pdfIn PDF document text
    • http://sushi-belovo.ru/files/1584493329.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/dajex.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/fodebujevoxusupudufabew.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/04ef24ecf41a72a902a5fa1409b8a3aa/8551312472.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/53468736267.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/28036997569.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/jezafexizifez.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/13528962419.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/rituluwuxizefi.pdfIn PDF document text
    • https://indolabtek.com/Uploads/userfiles/files/67422424155.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/84666618800.pdfIn PDF document text
    • http://luckysim.com/userfiles/file/44822087814.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/vumafulixixu.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/dikuneduwezifelus.pdfIn PDF document text
    • https://e-room.co/userfiles/file/gurefedof.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130061723c71---rinuz.pdfIn PDF document text
    • https://servauto.fr/img/user/file/gofopivinaga.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_off0000b9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E0 11668 bytes
SHA-256: 87f3ed929fc0369dfbdf533761a31cde7dec37089aca3c14b364c9499a65f906
font_01_sfnt_off0000d594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD594 17648 bytes
SHA-256: 5230e2349ed1cf9a32c08a50a380baec4455945bf64022d8ef80a63cbab6bc5f
font_02_sfnt_off00010313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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