Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d20c88363b12e2…

MALICIOUS

PDF

167.2 KB Created: 2021-09-01 07:04:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f486da0de6277b87fd508b9353da0545 SHA-1: 827b922a6cb12b28c202f8d1ecc67cd5958b062d SHA-256: f6d20c88363b12e292c6ee1f157b1a8bd83b253617320178d9b9ab515371a201
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, likely intended to lead users to malicious content. The PDF structure itself is simple, with no executable scripts embedded, suggesting its primary malicious function is redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 https://biocoils.com/img/file/17976961098.pdf In PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/aef815c8f24de398b985063340003878/monopasunilinanapatat.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5d49c5b35cd53a615b2e228363a73cbd/84931636655.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/96143104228.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/waruferarijatuxij.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/kapogeximebibejabux.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/69625321219.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7133b2952---83512719997.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f43517793---86874164726.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/19665257231.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/2ur1de8ngsurvhdvil6gg8gj2v/gokekipirojezetavajejo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/7p96590l2vg9283306ubs72534/lavevuvagunotiwadow.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/lafuxuza.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/vosaxemuvudikamugefidagip.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e6c29c34a6---7862386409.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/49929429421.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5mm279vsh0ng54vsv3j2a58ufj/5901424031.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/84080626169.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/dapimi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4b55bed8e2030115e4dda32304cefbb3/58709578581.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/effjave07vs82f65adlnlgjsoo/38332239068.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/52007082407.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607584928c185---32730847506.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/jikono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=grey+and+ginger+catPDF 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_off00022f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22F15 18312 bytes
SHA-256: aabe13d3b3095d2bdbfa1f6db651921ebddaa9cf96ba142db9f389a0f9ac5368
font_01_sfnt_off00025e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25E86 10364 bytes
SHA-256: c06e89544aa5278f62feee28a9137c1a3f1ec364b1484ac41d2afa203dc17e7f
font_02_sfnt_off000275dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x275DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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