Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff0a2ede97dcd85…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 18:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fadb9ddc07a1ff296b11970ac6ce4a1c SHA-1: 1519889f6731b65a619e87b378c7ef26688c9d9c SHA-256: 3ff0a2ede97dcd85c943bf738b13abe3dfd92adfee28c68ed66c7e116855d51a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm, directing users to potentially compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://rcp-ranstadt.us/files/39780522320.pdf In PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc93c70b4---pumuzobup.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091110034786.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2f68735a4---kemibomumizeduxa.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/tubozigugadiv.pdfIn PDF document text
    • http://dytac.hk/userfiles/jamosurasexolepez.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/geratuwobovuzil.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/57818546359.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/lowages.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/kuguxomubuzituwo.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/xajebozebo.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/70249297080.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/wibusobozonakulekerop.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/51454166899.pdfIn PDF document text
    • http://analhospital.net/file/files/3253361818.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/56164722047.pdfIn PDF document text
    • https://ekransamara.ru/files/6269678769.pdfIn PDF document text
    • http://jawarakreasi.com/file/16086322416.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/9539150502.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r4klqqjf2nbgkftur60kvmtdf0/mizukexopewogelogapotupul.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/bapudazet.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/21469201370.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/68863837895.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/61986535112.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/vorukiranazaxoxam.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/dajezotudasupopuxezase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+apk+with+obb+filePDF 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_off0000d5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BE 10664 bytes
SHA-256: 6d22d0dbd5b60e1f2696f54270d3fd05aa511156f050e05bc9eef9064e222558
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 18224 bytes
SHA-256: d10ac3e5cdbaa13f8fed68a006916624c558cad89098a0b1e145d385290b012e
font_02_sfnt_off00011cdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.