Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa2063f92c65e945…

MALICIOUS

PDF

74.3 KB Created: 2021-09-02 10:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f603d37dcd7b645c8cbdc188f56b46a4 SHA-1: af63449b4ed6f09ca9e5d17d30592f5633501dd0 SHA-256: fa2063f92c65e94502c3166178ed2772ce17579bd151c7adda3ea75227055196
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document's structure as a link farm suggests an attempt to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://instant-image.net/UserFiles/Site/File/nimenoserobejibipero.pdf In PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/89794545053.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a415576e8e1---31425471513.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7515de4f0c---kuwevevorigijudijub.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16126ab1315b83---19346396426.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d4trcdee5pr2nk0ks2m5qqvpfj/89931990362.pdfIn PDF document text
    • http://gestioniarmatoriali.it/84454924383.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/98587848476.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/6nepnb18b0d4me45m0c3mr3o2d/10101790421.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/5842280468.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8bcda282---85780628342.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/80615036647.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e4580988734e145257a7e6e056df21f/55437895799.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/drejrm4t9jin9halpcg68floc0/bokezapirare.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/5fc220298bff8aafa779f9fe10eb895d/perinu.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/20277812186.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/fomonadexufuvajupakisuki.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/jijokefuboxutip.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/43996183126.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/89788760759.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/97404534467.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/554240beecedc4ac23e7a387e4c29f30/tuwidarojafabe.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/mijijinutedizekujojeduge.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/21092563935.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/jewixageva.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xodenobuzasusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=current+weather+in+chicago+ilPDF 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_off0000c0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0CC 10560 bytes
SHA-256: 8e4e8d94874acc1f39317b00862a07c63ac050473ff73a65bd48c74740e1f17c
font_01_sfnt_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 15980 bytes
SHA-256: 9a6da1dc4d0aa46d455148b4b824548e68945267af5963ae939fb0f9b8651303
font_02_sfnt_off000101bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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