Malicious PDF — malware analysis report

Static analysis result for SHA-256 582ae13b6262a34f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-05 03:46:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff0857648f2c58ba2699c7005c4835a7 SHA-1: 1e757ca6d5e558e7af500c0a4d58169db207cc1d SHA-256: 582ae13b6262a34ffd44b41e3353cdd42e9751579808c1c71bd3f9df59955941
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary attack pattern involves luring users through a seemingly legitimate document to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://abwingsmd.com/uploads/files/vexonekigosidenifafize.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c8952905c---goxenegafalewavezenugili.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/35259550483.pdfIn PDF document text
    • http://ahchala.com/img/file/6722530718.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/wipipezul.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/35099512936.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/31953461821.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/buledekakarefowivus.pdfIn PDF document text
    • https://amblamy.ee/upload/file/barijav.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0242dte0emug99j3of665g50u1/nuvujumosobojozisut.pdfIn PDF document text
    • https://kar360.com/resimler/files/61003687751.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/87072619213.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/71482273519.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/b00a9f1644980eb6eddee034954c85ae/27678844657.pdfIn PDF document text
    • http://getem.pl/files/file/37739192294.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/guvirokugaguwowumujag.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/11c93f0845c0cd79671a1586320f3ce9/takamuju.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/31f9cc72e0d1b8ad238abd49d1b0bd08/zadebul.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/bf3991ae8af0e0b53e747ec9a291cd45/wizesupenutikitili.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/28164339404.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rlm78cc69t47l5l25l1g55epf3/sowutiriz.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/ub5fkrn8bqjmrjnhk2viqa5cbl/64386996851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=history+of+afro+asian+literature+pdfPDF 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_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 18392 bytes
SHA-256: fb8a7f03505defdd3171aa224986bb0ce53baa2de3c2b599c25fde15fa0ea812
font_02_sfnt_off0001379a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1379A 10696 bytes
SHA-256: 8340da09a80699f472ecdd12234979e13c853ceab495527f5d110091892ea3a5

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