Malicious PDF — malware analysis report

Static analysis result for SHA-256 44858ca3fca07fe3…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 13:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 444c91eb0a1eaf22741595b2ea7538f5 SHA-1: 61937b6ad696815d141df1bc5735738b864e7661 SHA-256: 44858ca3fca07fe3838e4e5e64f36950fedc542aaf281a80dacf750593fe06f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kimcert.org/E/file/fakasikowoguta.pdf In PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/larikaxosedufixivo.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/u8kls8pbul6v1uo4b1f0dc267a/nuremewu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/15d4c5a9f689909467db363789bdac19/lupiretede.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/vexolenofigarovi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/5498471622488d23a63dbcac498a1fe2/95009833028.pdfIn PDF document text
    • https://www.totalblissbeauty.com.au/application/third_party/ckfinder/userfiles/files/22104422433.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/50458409896.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kabogur.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/dabukojodupatonawotap.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/49633485460.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091823520251.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/xejomiregeraxatepikufogep.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/65476411047.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/romugako.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/nufowe.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/9677584803.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/faxizirazapir.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdf9d79a62---73667437048.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/natonozonikarobatowa.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/ziduvelewi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/svi8hnkaabn79o6h9fodjd3ecm/66976929383.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/14861351378.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/nanimesurosuf.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/72262988708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=4k+3d+led+tv+price+in+pakistanPDF 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_off0000c5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FA 10696 bytes
SHA-256: 852f9b2ac5c01f991bb69bad7d4605b6c4cd3c5a0738cafe1c8feaf65dde895d
font_01_sfnt_off0000dea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA9 18228 bytes
SHA-256: 133f03c4150fac1edcf884f742a253ff8643d078dbd49c315b032583b477906d
font_02_sfnt_off00010df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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