Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66b1c7b7d304884…

MALICIOUS

PDF

88.6 KB Created: 2021-08-09 22:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a228bee456d34c9a017e068f24e12d7 SHA-1: 86a953452f8b83bbb57f15111fabf341bb65b9c6 SHA-256: d66b1c7b7d304884b392f406b61085532a5846ea4e4423bf80cbe63017f1bd93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded URLs and the nature of the heuristics indicate a deliberate attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=sarkar+tamil+movie+download+tamilrockers+isaimini PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085681ebe4fc---wixesefumufimovoza.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/lagegen.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/61376014905.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/47197105434.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/riqjcb27piga5sv8gmt3t8ic9n/zovagamafugun.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/n2f5k1vv4d7ge3evv6totkc2q2/14735890234.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/22058498829.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/vutekerebopukijefafi.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/c5c4176cdd5de95a474c23f41841db56/manisuzadonutuposo.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/baxaveguroba.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/zimogen.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/1b8e7654cc3a08d34e3cb88a9e6214ce/temukiruleku.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/wazalodejasubabu.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/23197648635.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610349d56c241---31922099880.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd0204fd---gujozowetuzezas.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/c325db385a3efe617c4641bdaf645a62/razifijikanezowaga.pdfIn PDF document text
    • https://12shio2.com/contents//files/xazufekesatulutal.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/4rdqihqu0olkaddk46s7l1na52/fujekewonule.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d28a222a---71346871548.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb92a6b4e---newulitijowus.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/vulelabowulor.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 10852 bytes
SHA-256: 71dfa5df692c3e21e037d0b843a7a519202dfa2115b97d4b32e317f3a44dc0e6
font_01_sfnt_off0000f65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65E 17896 bytes
SHA-256: 67fd8d6101b06fa55a40efac1012108f30caf47b34d6d6c772407a6ace92d421
font_02_sfnt_off00012574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12574 16548 bytes
SHA-256: 82dcfcaac72034845c08c168024eb3e41ad048e49e7ee5100401eeb95e7c755e
font_03_sfnt_off00013bd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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