Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b3f4ffcb5c6d9d…

MALICIOUS

PDF

121.8 KB Created: 2021-07-06 22:19:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7de52504b859599a7141c73d7b41c796 SHA-1: 12bd085f187b2828d98a363a8296edb4dbc063a2 SHA-256: a7b3f4ffcb5c6d9d03c57a69eef46f058d23335c9420c1c5b8c690fe4f7e0037
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://bajcsidavidfoto.com/_user/file/bijuvupep.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bb446b166---36671310840.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d1c1720aea9d1fe79e7e9417e844422/medobopuxefitefeninarud.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/5ef98b600a894e810436c44bf449ddf4/50646145800.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/3458686652.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc2eb04046---fowedamuvigodesetudogomo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b2919e15ffa35f8d70e8e181f2a63638/47030531145.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4069d5f8b---pevefiserofemi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758a89b962c---66576203014.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57191aa298---xekilozaforonepemiz.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0d10qamdmi29e413mairk4bo4g/98981469668.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb2370e90---77408070006.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/tuguwijomox.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092aeacba16c---92977660121.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7235fdb7e9f11c62410357c90f1a7187/fotomefenadiw.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/f5ce6152f6099d57a75ab3595602d7e0/buzoj.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/27937890683.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/55009935942.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e15d285aa75e5451115458c8c36f073a/bovagozawulisukiliwi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9109b15996---69565049571.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1e0414f46564294f8ae99bad26c0a308/72985304493.pdfIn PDF document text
    • https://chp-travel.ir/data/file/48597029523.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072725965e13---98215051815.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/588fe213043415ad6d393eefc4c7997a/lijodadunixuxidubawivusup.pdfIn PDF document text
    • https://avenue102.com/uploads/file/50597164241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=endosperm+and+its+typesPDF 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_off00017a06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A06 10604 bytes
SHA-256: 11d2ac42fa0a3c885738fc6c9ab14947a44ed46adb90a280fdc84670832fb21b
font_01_sfnt_off0001923d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1923D 17916 bytes
SHA-256: 304d8d85338ed9618936d55f37916778d06892bb4f34e02ed882fe4cc58fa2b1
font_02_sfnt_off0001c16d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C16D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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