Malicious PDF — malware analysis report

Static analysis result for SHA-256 5867313ef0470296…

MALICIOUS

PDF

68.9 KB Created: 2021-09-16 07:07:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae64c6393b67af04f458f5c7c6b97c27 SHA-1: 4a3c9b2e467c71a3f6f68f63434db0a98fd05e0a SHA-256: 5867313ef04702962e2a3a094243b0b4430cf950edba24b380512d134779c9b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs and link farm patterns, indicating a strong likelihood of phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites.

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://infrive.ru/uplcv?utm_term=apk+beat+fire PDF link annotation
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6fa5bc3808428b7846b00e8619593a74/golusujosubosavugez.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/nosugunuxam.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f885ed7a4d09edbb0cbf539e5567de03/69214581152.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/98407036666.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9f87bb27ef73bc8c10f27865bfde7514/11671500028.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/luzadabab.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/74358197688.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/67566624663.pdfIn PDF document text
    • http://santeh.md/img/files/zakikurajepobujamum.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210906063135.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/25821276591.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/57950835290.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d088891235---52403003088.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/13628767468.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/faxerevox.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/luganotewuvejovevidowipag.pdfIn PDF document text
    • http://chieucoingason.vn/files/jikevewurupifaki.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f38ab5cc1a6bc516f4f4d786d00d37fe/59767680991.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/modirajokavorulike.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/rategalusuk.pdfIn PDF document text
    • http://recrute.fr/files/files/kiguxedaworivi.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/soburunuvizubeg.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135ff8b87114---nudutikepisakazomobiz.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/20978086907.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/58049032562.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_off0000b3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E5 14312 bytes
SHA-256: ce861c9473d6d4f3fa07eb29a20299daa42386157aa1dfb41b19fae7c5bb4f9f
font_01_sfnt_off0000d76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76E 10128 bytes
SHA-256: 5c19e8a728c37b686cbdafdf55e57b3866b5d7f0e23cec51dbc34a2957f9d46a
font_02_sfnt_off0000edfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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