Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a26057dfae3b3f…

MALICIOUS

PDF

100.1 KB Created: 2021-09-06 01:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bad22dec5833d3f8c26d3d5a5d084072 SHA-1: 3b946a5ec3865f6ac231e1cfdf8bed568d293f7f SHA-256: 29a26057dfae3b3f8d36961a2f53cbaa63350e436c49117231011807ee9e68cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's used to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://suseefinance.com/userfiles/file/solisurusiv.pdf In PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160834e9471748---55765640444.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed1c11ded9---24982780516.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/76705891658.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/purewifokoganixe.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/megokupixiwazemakogino.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/274577paer7icot98eqhht4ihi/90054833281.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/59756660550.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/gupifipepilikepam.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/7i1t1c1nct3lnvnviobihegmfq/25904376767.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/weferelex.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3229314b60---wukegavadu.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/ronavezuredipurofoxerov.pdfIn PDF document text
    • https://0900107678.com/upload/file/kukiwazapomuregosig.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113af13d2cd2---15030958805.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f5f10c024---zadomaximuzanasuxa.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/42364204376.pdfIn PDF document text
    • https://actorconseil.com/files/file/87223393975.pdfIn PDF document text
    • http://royalgroup.at/tmp/72045331256.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/99172111791.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d559e2fd27---refudemigufagetejopu.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/sugufupif.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087357824859---galuvixunukewogezefasan.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/4nvl4pb2kk4mhtggq32mn02e73/milabemezobab.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/47357423058.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b658bb52c0b---8954185048.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/54736125776.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/nepagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bogardus+social+distance+scale+pdfPDF 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_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A5 10948 bytes
SHA-256: f8964f0b9a9ec7d167a85a48046245b65a5c2231ace6dfbb991320b8b7ccda7e
font_02_sfnt_off000150f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F1 19348 bytes
SHA-256: cb5d7bb14e4dbedd52f43e7dbae9fb8bd6e7772bb2332b7e9daf5eed61b39103

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