Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd666132ade1491…

MALICIOUS

PDF

85.9 KB Created: 2021-09-04 01:20:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bb4d06f46711806ff73d8e5fb29a3df6 SHA-1: 369e46a2cc9a6c602c9a0edeea11c783758aaa62 SHA-256: 7fd666132ade149187c32ddebc2f475cf06f74ea4fdca0a26c4850f277742c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings suggest the primary goal is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://haps.company/wp-content/plugins/super-forms/uploads/php/files/c3c6g1l8fkb37s0ucg61ggltn3/dubufodo.pdf In PDF document text
    • http://sgyscom.com/upload_fck/file/2021-8-10/20210810045148807074.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/86387844559.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92702139006.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/godopivokufonafukamev.pdfIn PDF document text
    • http://asvpp.fr/pdf/59000213802.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/52561614024.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4922d26610---46282945464.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/pp3v3jm9jk0ii6g11t2d7um9t5/18428801571.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/lokafufevozi.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612677cf361de---selepebawudadefexaxik.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/gagelugawifutipe.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/rabomitovuwamodibemuse.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/vebawuvepofagenimufiwonol.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/40878298058.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/0d828d4d291df72c87a29754fbca8f9b/zujagamiwetojad.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/95c9c9104be1510b7f933986af026cda/45674265573.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/71f365e4ff7fa9917284cfe8134d5d5a/29292276604.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/luledob.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/68601919824.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc4a35fb5---xexizuxumitisatika.pdfIn PDF document text
    • http://studio-rivetti.it/userfiles/files/fabelumatiwex.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/56677911929.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb00b17620---xuzipifanelumumubid.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/95983427148.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d9deea86c01---vejunupegolumil.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/44021904557.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607464c310428---78523223046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=syllabus+of+upsc+pdf+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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 10708 bytes
SHA-256: 5b14717ed273bb8e2d85c79e2022fe24bc886960ec23ca1487b8e1f388f47395
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 17916 bytes
SHA-256: 58df1d1d8b918e7b8f03d4119da5b36e357759db756934067dc5003363c32cd5
font_02_sfnt_off00013209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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