Malicious PDF — malware analysis report

Static analysis result for SHA-256 669207f7c53bc9b9…

MALICIOUS

PDF

81.0 KB Created: 2021-06-29 17:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 270cea156cd55f9d27b04bc9b0945a67 SHA-1: 701cc21a2cfa8167639cf41f03bf241c14966237 SHA-256: 669207f7c53bc9b94f17cde498e2d643cdf09cb12d787a7e26ccd7a8eab0e218
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised websites hosted on various domains, many of which are WordPress installations. The PDF itself does not contain executable code but serves as a lure to these external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/4a9f2f2b712371b1936fa5330ae23378/wobobakutomuvazefapuweva.pdf In PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bhbb0pmb8pvbpif934u7u906pd/tefaxuwobiv.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098be94f2e7c---robajamipolir.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/buvarufokarapiw.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/migenapowewegi.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/d4dfecaa2f93b5b5f30cc179bcad5eff/kikaduboga.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/jenevuz.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/cc7acd12c134246de277e26e273bed74/94170042428.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/xorujuwazaganiwixo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/757689f046e1afe1ae6f44d72f414b0a/zabino.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9da1e6fbb2d13bc2db4a43946485152/22555522864.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/b57rosdm9ld7ptb45890l4u5um/suxubabotenulemigepus.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/74cc4c4cf4fc85a6c377f4d60f5e7ec7/13518195.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/68b8003b55e598063b4d46574d77d6bb/mezusutitikesawezigato.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dd3399f5---bopatot.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18ad9794ee---77042281811.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/f7f28af185f76f86e4c96cc5ab94ac6b/dojuvepikaruxofu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/4ffe1a2962420339c31b69e285f59e04/wuxiloxafe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c51f7225a---janupiruni.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/60689662603.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/bagaluse.pdfIn PDF document text
    • http://hpc1970reunion.com/clients/3/3e/3eb4c5728feca7eb79feed4eed44c519/File/gejirikilotikimos.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/ebd672b4eb0fef685f3d1201c119732d/zunidaxa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/pagamuxadegadikajuni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=healthiest+vegetables+for+weight+lossPDF 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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 16520 bytes
SHA-256: b98667524c27af2f52db2dec657703b546e2474a9a0e90e491b9ae2336c5612a
font_01_sfnt_off000105ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 10672 bytes
SHA-256: 11e7dcf0be41309351da64dff3292bb97009aa1b6f5b1836500daa766f5f75df

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