Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0f1ede6b2334839…

MALICIOUS

PDF

90.2 KB Created: 2021-09-02 10:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ac58b3ccf9fcdce079600d58e67ac79b SHA-1: eda71a199feb81766ec7cf89363133a981f75abb SHA-256: f0f1ede6b233483944d31369f1864d7688bfc222fbc05fe6b622a42414c20a62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high-confidence heuristic identifying a link farm pointing to compromised WordPress upload storage. This suggests the document's primary purpose is to act as a lure, directing users to download potentially malicious files. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kco.su/userfiles/file/29749894529.pdf In PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/sorixamutediwegajojixoxo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/40c8f2b0435a94145095ef76fee567b7/govapunu.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/rojelum.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/luxetaxafilog.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/guvefolejugabikavatakofa.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/wovipularefitodebi.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/vatuxa.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/62253224610.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecacadc97---6280616353.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1b70ed9176c8e321f840bc5d6069b560/sesuwak.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/21709657360.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611da25ae8208---keromowasev.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/1542620339.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/75473805325.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9a65f22e521b3a044dfef946acf2343c/70085847381.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9fa0bcbde852ff3eb4e5814adadf461/tavetevet.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/32225648a58da8e204d9d869775b0bc4/fifet.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/9r5k0hhldhilclpig7dtk2hkc5/kidejogupugoroduvazeki.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/50053555099.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b4db8588d7b4a82df3ab6f414a8044a/wileriworati.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/81995056329.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b43725e308b---zofifububelavuromiv.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e4da6f701---datokedasemaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mac+os+x+snow+leopard+iso+for+virtualbox+downloadPDF 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_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 11100 bytes
SHA-256: 7539ae5e22ae839fecc7179226276d098c5dcd445ce2b38d1d090fab0ebd988b
font_01_sfnt_off0001091a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091A 22464 bytes
SHA-256: 92152923fcae11e632214435727e5ce8e2c3e8681954452c68c3189a0f0ce22e
font_02_sfnt_off00014227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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