Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5cf569c3ba6860…

MALICIOUS

PDF

84.1 KB Created: 2021-07-08 07:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ebfdc26aff102561001d150d672d6868 SHA-1: d09e0876f6a484ae855fb9da2c8d4593b034c148 SHA-256: 7b5cf569c3ba68603931c9e616067c81ca856afa37bdd681846639aca0ddfd72
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the ML detection indicate an attempt to exploit user interaction for malicious purposes, likely leading to the download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://veraschwemmle.de/fckdata/file/boselavajawiwof.pdf In PDF document text
    • https://aduanaldelvalle.com/userfiles/file/38439743777.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/rovaludurenumomewibiga.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/87527259649.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/rqbr9p2307n2934kojmvnhmqv5/lubazefibop.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecc875669---kamixirebakojudafowe.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/viwikegiwik.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/8eca37eb8a2299fb8f1020e988a36154/biwapitedesefa.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/62218010011.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/bcca0df5f7eddc7e431b78f423627181/kugijoraworiz.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lsfj1uohbiropro9t0mcd8ub01/49589548884.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/61337749886.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/robabumaxozu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3515bf384d---8098089556.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/widumoluvodu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c13401dd7da---sipixutuvim.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/10112684280.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/201620348973.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd65ae28e2---dozevineki.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/ja1pa4gvgv60nk740e4osv2tct/55169795832.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a898902ae---nesewabiwopufoxigejabumi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ef6623e3---67211784472.pdfIn PDF document text
    • http://18554080.com/userfiles/file/sebikawuluduniravifok.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b486e712035---38820736325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=coaxial+needle+biopsyPDF 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_off0000e75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75B 16632 bytes
SHA-256: f611a15a774ba8d0f2da15ec6ed6224c11773f969218aa88f69cef75fc4fde7c
font_01_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 10572 bytes
SHA-256: 8b3c50d5b2731bd0a35f7814544c9f61cbfd42baafd3a44fc154e09097f1e61f
font_02_sfnt_off00012ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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