Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f68de49ee208e…

MALICIOUS

PDF

77.0 KB Created: 2021-08-27 17:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5917306476950300cb5423418a31686f SHA-1: f3dd976da8a3b4f1d3446fde1c900f481d1097d7 SHA-256: 1a0f68de49ee208e4c9e6d5d4661ee5adba716228120d474b3eab03b68f0b979
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs suggest an attempt to redirect users to phishing or malware download pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=life+is+really+simple+confucius PDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad33c13d8fa---65487647367.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/8e44cde2bb6b2c14d2498c9af4ad5fb2/32114090304.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5972aafba4---43203483008.pdfIn PDF document text
    • http://sibservis.com/ckfinder/userfiles/files/xudinetarifudavapavilo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a3de4abc9---gusebulifinaregopezisudu.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b867be1ebfadbc455ce9ae4ba1ca1a74/kagonevilopisidofibetiw.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/96651431411.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/81093200339.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/zatejud.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73206532443.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/4405279032.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/69586935834.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/golawekabe.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beb4453b1f---64770547726.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/3295dcf2940f5a32009354b3167bf32b/26433858905.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/rojezitojegosagemifixuw.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607576fa4787c---22786766742.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa7f618be---gusarar.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/tarikulike.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/jruc1h13n0ufhchtjjkv2bnjg5/14144815032.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/kofevukusedutexo.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/33382544418.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rt2dqo9immu2kmdn2hbuesn0b7/26924384477.pdfIn PDF document text
    • https://superchills.com/userfiles/file/filenoxabezudapenaxupasa.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 10712 bytes
SHA-256: f48d0a42ab2311a84a096181d794f597458c7073fd01086e892c4979f0f58928
font_02_sfnt_off0000fb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1F 16744 bytes
SHA-256: 51889bcdde8b4152a16c172800fb57bfa38b2f7d9de8e114c2baf5cb2aca2248

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