Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b78308e5c0ecf7…

MALICIOUS

PDF

84.7 KB Created: 2021-09-08 01:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 806dc91c8766e98f17cb9758216a17ba SHA-1: 9ca5bf9bbe062859f1f313fa9a35830627c32af5 SHA-256: 68b78308e5c0ecf7aaa29b7ad294415227a21c9a076fc3ccd60c77495a07a274
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nousgarage.com/userfiles/file/bomizarefitonifesig.pdf In PDF document text
    • http://dadrarad.ro/userfiles/file/63756143211.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/xejovarebeluz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d80febc2b244f248cfc3a13fcf7e9ca0/43188692697.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/pofetozepodazuladu.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/98270793610.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6137d4346fbe7.pdfIn PDF document text
    • http://abpaluso.com/upload/file/xogufinovekedozitisivimo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4833ffb9---mobizunepetunigukewegim.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mogegalejiwebeselofog.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/salawimuvubawomurakifunar.pdfIn PDF document text
    • http://carefirstyoungatheartgala.com/clients/b/bc/bc61c41cf33a111e4089ebab1e34a2ce/File/6071683793.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/ac340bc3f973f6ef2af3d7c82fb8dc48/20229033293.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/jonulosage.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3655e107---sejajusawibopeve.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607313a3324d6---naxodopapavaza.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/fuvomenazagoxabusipupexa.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/petokelelenusugokinepozin.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/11831432915.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/sojixexigevuxewaxolilu.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/14qovl1cjnncjljar3k8gp3jed/jexidasetapavepujimo.pdfIn PDF document text
    • http://petrduchek.com/files/mugomovumomepopajabis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nostalgia+electric+ice+cream+maker+manualPDF 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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 10740 bytes
SHA-256: 4116eb1a2feef1a53b492a06751e4d3b25c27ffda1aa832914c69c3380a6b0a8
font_02_sfnt_off000115a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A7 17972 bytes
SHA-256: 734f45962b0de7ee2ef43ae844110090dc1c6c4395567b1cede715c6c129f511

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