Malicious PDF — malware analysis report

Static analysis result for SHA-256 16caf200aa670900…

MALICIOUS

PDF

79.9 KB Created: 2021-09-02 23:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5be84305d73d076b9a56d8137b645782 SHA-1: 8a24e91bb95cfea4f92f7c858e9a3e44b44272d2 SHA-256: 16caf200aa6709003e67fc54714aae62878d9f7927fa7ffc290dea7e56a1a363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The presence of JavaScript suggests an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cavusofis.com/images_upload/files/77634364075.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fea95e145f---pabanemonogizefujowugu.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/zifiriwukawepodani.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/ganirajivixutilitus.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/f6291d47fa11d57b88c36180fe2a7c97/wetubarelu.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/17780777721.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/65300307730.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608376b39d6db---wufadekajutetodekibobix.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/ukks5rb0vrd0ofhbdvhmdhmjl4/fodaxowirupibuguditep.pdfIn PDF document text
    • https://nicosiacaffe.it/file/gadijinamifineju.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/5b8b2f3faf3618541fe73be3dbec4648/327023655.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c350e1702---28171535613.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161142dc61e7ee---favovepomi.pdfIn PDF document text
    • https://bem-sa.com/img/file/sijapug.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075b481126bf---nalimamukedunugofu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb8da51b567---93309035969.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/zusivumosijezula.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/81984317175.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160fc32c193f64---bosinemokuf.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/ronusufebozodotibazod.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/13ce989da3c16691832667be2028366f/wuwogibe.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5d865ffb---6353132962.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4cef77f68a9ef1d05140009c16f587d3/1583109760.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/nekuruwubuxa.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4de914e20b3939c9b0c7e9f9ef0ac05e/keluwugovebutati.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210803_2830558CBFC64207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cloze+exercise+worksheetsPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/7bb5e5cbea6be8e699284313466ae181/godufudizodosuseme.pdfIn PDF document text
    • 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_off0000d37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37B 17972 bytes
SHA-256: cc949dda86eb306771770a243e111df118ad905359cac21d677e1436a557e7ec
font_01_sfnt_off000101bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D2 10432 bytes
SHA-256: 2abbfee018640ac899bd832a6830feabe20dd9af66b4dab3b0dc5c317280e9a2

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