Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b05701bab7443d9…

MALICIOUS

PDF

77.5 KB Created: 2021-07-03 22:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b443a6cf9924e1254e66909fe3a78437 SHA-1: f17c38346b13d5e50bd95cdd28c4e7ce82e480d0 SHA-256: 3b05701bab7443d93ca0ac45cae31d8a831c0584050199a043d5c6bafeff5f4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URIs indicate an attempt to lead the user to a compromised external resource.

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://crysiq.ru/uplcv?utm_term=physics+1st+paper+by+shahjahan+tapan+pdf+download PDF link annotation
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/4ce9e55d92330d50b970a221dfd477aa/55601142405.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16082029bc63fb---memaboxijupenolanoso.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc6b66b496c7dd4ceb82f62106d806b8/25880991081.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/tedaviremajogukujina.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/cqtsfmfrppm5slhkh74olu93ko/53052541142.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510072739.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/93778729634.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/taligeziwukep.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/0575c80a6de96a271d2b4df843850593/luvixududakugij.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93b87c5c6---mugigirazubukekunapudali.pdfIn PDF document text
    • https://masukpt1.com/contents//files/sufanurasi.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/80666420295.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/kirizoduzefewuzino.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/77568762253.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c692a6baf7---78162910082.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4a4b4eb51b054758225296af01eb82e3/jimofibinitefixisi.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/8b4f0bbfd4dae94a67ca6f96081b092c/5221942134.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/foxuga.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efff2ba65e4f1dc278be6e74edca083c/30284805295.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086964b0b631---1070969294.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_off0000c9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 16516 bytes
SHA-256: 5c5a1f63a56194c9900a7852bfcb707efa1627b89d4374ed7782eab60d178c76
font_02_sfnt_off00010ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE0 11240 bytes
SHA-256: 9a5fc781870316c03aecd613aed357573171fef74c52d2233ca0dfc516817ce0

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