Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d372a2829e050b0…

MALICIOUS

PDF

82.7 KB Created: 2021-08-26 10:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 012eec7e875705e4a9cdcfbc0b5a4bf6 SHA-1: 7d7027a97ef0ce4c1bc37ca33eb1e51fabd890ef SHA-256: 9d372a2829e050b04a7d36303e457bdfbbc14554cdd2508e815f8bcf96db7245
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7af1e1ee---3995364501.pdf In PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a0389fbceed83190b3255b6661ca25f0/wexokokebisotedonobidudol.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/vilinivuwuvezotadariz.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/29952595683.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/646b5b3c891dd9acb09e55be2b0eab29/76268364668.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/47441076859.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/fetemad.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5285d68bb---55920550541.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609413124aeca---16062103449.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c75b7b93f7---59645916853.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f102eab2---vituxusonuxow.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/kabixisumasosori.pdfIn PDF document text
    • http://laduses.nl/image/file/ruvejasaseta.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/95d690be30b13aaef56faa327eaada08/vomorumoxixuzuju.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d3a0bd6c4---sesonato.pdfIn PDF document text
    • http://medtek.vn/storage/file/fibufuluvi.pdfIn PDF document text
    • http://www.provinces.cmcgeneralate.org/files/js/ckfinder/userfiles/files/42951002013.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/801c3e3da41f9da95f6f2de9508d7de4/kanolola.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/1e8b80046313d19c45e665c1707a2495/xozebakiboxilovoxunejon.pdfIn PDF document text
    • http://cutskytools.com/d/files/23885043171.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/vvbmr6rroj0bqoaql7k906hmu5/tenufukolobetadowolo.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/72055581679.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/32e83ab3707d61fc3e8dd710510563dc/kobaxakividuvinawinaxez.pdfIn PDF document text
    • http://blueyee.com/upload/file/061300015672.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/81312715167.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/87598493258.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dea2b634c8aab8f379a9368949876ba0/74413473745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=joint+base+andrewsPDF 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_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70F 17044 bytes
SHA-256: 4f9d589a6a7c25853bd5fc1101504b477f26b801c25989733edce21c1accf840
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 10412 bytes
SHA-256: cfe4b0e7961609f601ee7158e32f3e5e5ce439d16c651371602ff2305583f744

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