Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc1a15fa239ac00…

MALICIOUS

PDF

74.0 KB Created: 2021-09-13 10:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bffe1b16e9f78cfce470954e572aca44 SHA-1: 8dc65a82dd9f4cd8ce67570643511c7b29c5667b SHA-256: adc1a15fa239ac0016f50345f3b7c9e661eb9d412f89e922a7d07a1914e8d28c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.armstrongre.com/files/files/tozazatowudofidapiwulabo.pdf In PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613112bb7cc27---79318912727.pdfIn PDF document text
    • https://tuinvandecruys.be/file/92153360994.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3954188ae---kofodamikibu.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/malenamidatowen.pdfIn PDF document text
    • http://roosprommenschenckelfoundation.nl/userfiles/file/69003024277.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/45603561042.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76e913e50---gugamadanipufu.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/2015916599.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/7e22c8e529d0b9ccccdcd101ba12cfb2.pdfIn PDF document text
    • http://df-2.de/images/daten/file/36551606746.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/55061247366.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/26579917683.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630897652.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/42978463938.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/14421245665.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/47035500788.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wufakedis.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/dubirurererofololotife.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133827049723---84261025272.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae544973a---suvewolaputupadepofijavu.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5d952ab43---77998726553.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/jopojelirokiz.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7a889ed2---48662730932.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/42705158875.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/74409303781.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/wupofi.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/38211698011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=things+to+draw+that+start+with+nPDF 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_off0000ba30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD242 18420 bytes
SHA-256: 1b828e4cdaef82f72db132f98844d5f9cab952ca1975c7216e2d4cc6f1734d4e
font_02_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10400 bytes
SHA-256: 55a09ce722feaeed2782d3f1aa176df96847a11feb3739799b8b89386d13e0a3

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