Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a7ea59de6f47d8…

MALICIOUS

PDF

80.1 KB Created: 2021-07-02 01:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f63bf0328a3722db28f35de8cafd8e1 SHA-1: 4578ac634b86d8438042f21975758c37fbbdc5d4 SHA-256: 19a7ea59de6f47d8f31ffb59d2c6e05e77f1aedfd50abd20ca3818b56caeaa84
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://thesetnews.com/images/fckeditor/file/filavafodo.pdf
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/vopagavemobure.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/21b3f9722da0ca7afce8d0032840adc5/kilikepufubupibubejima.pdf
    • https://bataretak.com/img/files/file/75683897607.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/40bcda5932540928df471b80be56789b/89752255688.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-6-5/20210605075441950786.pdf
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/a08e4f223a7713bd1d7ab936e1d615d2/sutiromelaresu.pdf
    • http://diclenakliyat.com/userfiles/file/piniwonubulepezuximutem.pdf
    • http://studiodrago.eu/userfiles/files/keluwo.pdf
    • http://zeguvietnam.com/uploads/ckfinder/files/rezotezub.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160780486da349---vavuzozup.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c163a66f---37959352965.pdf
    • http://ohstigers66.com/clients/d/da/da15611725e7ba20b6827cbf2e24f87d/File/28804298357.pdf
    • http://sport-way.ru/img/file/90252568468.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160baa97272f82---89132334729.pdf
    • http://classicalgardenornaments.com/uplds/file/30500081099.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c414bcebd42---19868145335.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a62acde21---kizefediko.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f179e6263c---patiwumomivemakuniw.pdf
    • http://traviet36.com/upload/files/gusov.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee8fecf005---refulenuwe.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7ec22d92---72018696287.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608589964fc71---gubifaderenir.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb2a79a9f8---71743728727.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pirate%27s+bay+charlotteville
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 16792 bytes
font_01_sfnt_off0000f057.bin
3ec4788e2800e02a861c40199f6238f5debd6907aa250b42a4ed804383e0d3a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF057 16728 bytes
font_02_sfnt_off00011add.bin
d8060d89c2689184d35ab1c7970465967b5ab56df668c74543f58de0593b55b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADD 10576 bytes