Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63ce59b76daf06b…

MALICIOUS

PDF

94.4 KB Created: 2021-07-03 21:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0c033e0c3d55e746ede8e5d7fa77212d SHA-1: 41212ec40a35648e568177ebbb61010d140160f1 SHA-256: f63ce59b76daf06bbf80af5dcd56d4921ddba8d5bad0251e972fc55a00b08ae7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple heuristics related to link farms hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The embedded URLs, such as the one pointing to a compromised WordPress upload, are key indicators of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/nitroiqkhfa47legce8rnmc367/65904055308.pdf In PDF document text
    • http://ankaser.com/userfiles/file/nazebug.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/50564484180.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/lavefinoz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f01f7534847f3a94499010274e419f68/fiduzofujasoxesasu.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/84315136671.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/37b8612ac5771482d421bc818750ddcc/suwasaragisofufelotexet.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb088e51f6---37287492971.pdfIn PDF document text
    • http://stylekd.ru/files/2063575043.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b828039504f---47907820974.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/dofimomozatek.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88b5650da9---61588118008.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/0msupb2ht8gtmhffc0b343cmq4/foxejidixesomekigenopiwa.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609986e2b0da7---20755799956.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/13791232418.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb53e23bf2---43206149725.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3cf85d0f407dc1aff5397ea55c062a01/vovip.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bepemikuwilupasufiwetaxum.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/005e97fdd4656328ca89b0539837e13f/nenexowalemewiwusefura.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/zofumonexaji.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/d01d06452806918d8ccdc3d8aea89b32/52995597118.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/28dd7b30396274fd0b9e6b29e944a61c/moxigabubar.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/83vnenktkq7h36brf79hv46lj5/zezezagoka.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/54005427615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=chicken+invaders+5+multiplayer+free+downloadPDF 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_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 30184 bytes
SHA-256: 4a2bb737d070f9a6a045a82c985e875b852c94ea72a33f596e31f8aa9ba55293
font_01_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 11508 bytes
SHA-256: cb6d242faf080eff4164788b2edf2ba7c9fe38aa9afd15ab2f8799abc9a7fa1c
font_02_sfnt_off00015233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15233 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1