Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc159983082e45a9…

MALICIOUS

PDF

68.3 KB Created: 2021-09-28 07:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 48060da0f04d04e0390c9051159386eb SHA-1: 3f507b43e9ff35ad11349784acc6fc4279171214 SHA-256: fc159983082e45a91efb981fc6db5b1a5d0e3abb454f106125c288df17d08967
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only document designed as a lure, typical of phishing campaigns. It contains numerous links, several of which point to compromised CMS upload directories or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://w-f-l.de/user_img/file/68142348627.pdf In PDF document text
    • https://luiginoiobbi.com/userfiles/file/36517267075.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109011649276735.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/jeganuporelegolipefoleb.pdfIn PDF document text
    • http://soc-in.com/data/media/files/70482567463.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/tidizom.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/50996410309.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614405cb4b503---numule.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/21539596141.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/vonewezawisesaxamurus.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/zozukurijizi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161370ab8c1d7e---28818405468.pdfIn PDF document text
    • https://eravikulamnationalpark.org/ckfinder/userfiles/files/podifugowekuliresezu.pdfIn PDF document text
    • http://terminsk.by/pics/files/vagoj.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/betubikogusuri.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/didasala.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/20dfad927cc35eb8a7b5f827fcbe46b4/mexemojizesuvuzeb.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/3864839892.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/8548dfeca9db069994138e4d7a24575a/tujez.pdfIn PDF document text
    • http://pasaru.com/upload/files/mapikusufu.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/lamuzisujewugisadevir.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0fa2e2ce61f9bf8db143657cddb8f94f/tefepedimijopugixodeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=parametrer+mail+free+androidPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 14280 bytes
SHA-256: 2b8bed2a50a70958115ca8645b30326cba275298fb3567d31e2f8d02c515249a
font_01_sfnt_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10348 bytes
SHA-256: 23bd7788a510b6a7eb47ed5852abfeff3887e4ecbe79fccd576520ed62184e02

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