Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf55eaa90d68a27e…

MALICIOUS

PDF

86.9 KB Created: 2021-08-03 23:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 38f98d57042602a1ed58d2945cfeaef3 SHA-1: d6c4b54e7d279eff2f1c09f3d78654222612d1ad SHA-256: bf55eaa90d68a27e234a868e40dd199e02752e80591c32b025b55eed0085dbcb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily corrupted, preventing analysis of its specific content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f065cf2c8c---muludev.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/42300050865.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160875610dcc34---xesegugebeluvobenibog.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/66980968094.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/a05j16l3ho69un36ne8hm5qrgg/fewudanigunurusesasevitid.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/josedowikudigisaxofuwi.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4d0aefcd3---65668342035.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/disuminobewixo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eae327d18b---tijuderoja.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/59039958810.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf665ad9b---13970160479.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/21450890914.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/e62b9e1b234861b0a2fbc0725f0f4699/vatul.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829dc936f3c---demamasetafekitigeju.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/ruvaxa.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4e7c4bee---logebupajamozeb.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/dabasixolojezaz.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/64463782559.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/23589097068.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94cbce2e96---zemolobojitajebajux.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/db1426b8cda5f63085db1f08cf1501a2/74476469970.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/57f0vb276o38ckjrvffbtcso1s/4029572720.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070169faa8f0---64996688955.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ejfje39gkam9obcu1rpvh5d6bq/ginupavoxuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bhoothnath+returns+full+movie+songs+mp3+free+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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 16936 bytes
SHA-256: 6a97ed926a39f8fed48419d4be836c99012011874b193998c3a2eecf7a03214d
font_01_sfnt_off00011ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB8 11424 bytes
SHA-256: ca24a25673fe9e0e22f72cc9b84713be733d09309ca28cbed8573169ff76f229
font_02_sfnt_off00013563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1