Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d050a46a7524006…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 14:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d7225177f7a6820411830b9dbccfc878 SHA-1: 88174930e19ae236108b4a93a005f2f8d54a7222 SHA-256: 4d050a46a752400690da824a4e151f7da1fae23e61ebebb9c3790271035adb3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further indicates a pattern of using compromised infrastructure for distribution. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=free+puzzle+piece+template+pdf PDF link annotation
    • http://mikomisushi.com/uploads/files/34741735935.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/57586014902.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160a944068cfd6---67044711837.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/64657444380.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/78614294149.pdfIn PDF document text
    • https://mszukam.pl/dat//file/27104447083.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d57985c5b9b---gomarati.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kixagale.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/83302881761.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/32bf0d1f8c3c635ac7eecde2286bbcae/25917126603.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pklfj5k98egen3qjr1bnhvmb9c/pigiwadujikulota.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9a63189295278dfe9b022dfe6fd969a/sifupoxisaxowumisudopotu.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/jelaki.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/mozadobabipalebufanu.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/29652831606.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/nizikiwegodisimilogamon.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g0s9nn2l1pc70cuhk3s829c9s6/54207332811.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/64971201904.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/36675064472.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612781d0df94e---6876252626.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a2b39b88b---zowojuvesezesezeked.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/224d4867f7760ae2228351a3a336311f/83726706426.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/10413480357.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/wanodupexupowokebagi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc543a3990f---14394174941.pdfIn PDF document text
    • 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_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10528 bytes
SHA-256: b749a18a968f8a644f0526f5d0e1d06a45160c9c9439b34e77da95a71b0d83d1
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 19588 bytes
SHA-256: 33fe5e40187aad5d891e36b67a7175483ee1ce3dfbfa3a09b85eb08128ecea83

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