Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e7dc26c3d35f251…

MALICIOUS

PDF

89.8 KB Created: 2021-07-08 01:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: da8423484e3e17bda79b2d37bf6f5bda SHA-1: c93e9346575e2b4bfb23c6bd24a4eb5cf696eae9 SHA-256: 4e7dc26c3d35f251551d05880e3d0ebfda6fd3f41c8ded6f7e3bc997ee085304
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate an attempt to obscure the final destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://3colorjazz.com/fckeditor/userfiles/image/kalevewafijux.pdf In PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/zasonebomibemi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2mg574s9ppvj00hod3qtcgpjqm/97227962228.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/tenusaleji.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/96487159225.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c97401f0a6---kabigore.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3d92e3349977ff1efaa375edc7f505d6/11830410561.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/bunabezavopoximolow.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/gupurimixabi.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160af95c0a4077---21276515796.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0a68f1f3a64bb8d7a9890b49e4a4fc34/15740947533.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608067ef874c2---79000286999.pdfIn PDF document text
    • https://bamor.org/userfiles/file/61055304132.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/pirijoxubi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609091177157a---68124188134.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/ee48783a00877839fcd55e29222692af/79299888768.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/19031223516.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/bae73357937412fc6fac003654f9ff6e/sawemifigewekeposiki.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/beludagegetavedironozimez.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/bhc8qi1ke1kjp4tmufa5ovn4i6/vetariwemapixofu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/hautfg385spo37hfjh00oqc8i0/16881167668.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lenapoj.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/37380225719.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/70954956444.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/tinudogubodotikanawap.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bcc394b71b865d7612f633b44df6e671/mabuma.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b55b10106---84388007713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=8+acres+in+hectaresPDF 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_off0000fc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC81 10272 bytes
SHA-256: 3a88a8876c0c6117de64c8da068df25a4c4e35bbd9168b87af5a4d8194865456
font_01_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 18128 bytes
SHA-256: 1770e68e51a25572484307ae4d4780006b91635564a91bbc02540446464ad1b2
font_02_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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