Malicious PDF — malware analysis report

Static analysis result for SHA-256 453c08c32d304eee…

MALICIOUS

PDF

92.5 KB Created: 2021-09-06 11:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ceb5850eb9dbc2c97ba6c92f8900eb8e SHA-1: 686fd16138279c6da0bf30327289fc6239e5e9ee SHA-256: 453c08c32d304eee09d995f29d8f2440ec82dad0fb29f28892a686bd90a27989
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://apsara.ru/userfiles/file/58197777876.pdf In PDF document text
    • http://comp-art.ru/userfiles/file/30179605373.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/31403729070.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aadf0580c73---wizaf.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d29ebd7d245---70400046872.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/kakamujexiwuxedexoxekezi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/128877tdb40ve73ckkjfv1l263/bixobitemikujanukadiw.pdfIn PDF document text
    • http://ashioke.com/images/library/File/bulamazelatukazi.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/76596383887.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a637247fbb2---besesusifan.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/71035096478.pdfIn PDF document text
    • http://iphysiology.ru/upload/galukadosoribumirexebep.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/jimusudomutezupevaxuboxox.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/37430766575.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160760d4c04acf---fupeborek.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/hthap56q6lm08l9nrqkdl5aj66/bevakuxizuwubefexadifaw.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d864dbdaed9d13fafa6d20f340faf3b2/21932045454.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4258e1e8---15890042947.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/vasow.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/sukafisugejawezos.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vunafidegepopijo.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/woxenobikozi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3s30lih6mien5of44mphk567b3/91517290114.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752bf13d81---93465587546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=linking+verb+and+helping+verb+worksheet+pdfPDF 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_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 11116 bytes
SHA-256: dab241005fa1ca324cae28a917fad213f5824f0eff90b89e72bb422eb0124df6
font_01_sfnt_off00011c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13434 18528 bytes
SHA-256: cb4be24e08226910c83d3735df068fbfb6b7e5c5afb3df07f161986011c4a26f