Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b3a2603c74cdc0e…

MALICIOUS

PDF

81.1 KB Created: 2021-07-06 06:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1a73992aa650b3bcadf3232cfbc814c4 SHA-1: 68779f3bf23cfb66749c51e8f304d26bfe5ea78d SHA-256: 7b3a2603c74cdc0e74e55b5fc7208b6cdeb08ac2a2a7da255a0a5dfce3662dc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically indicating phishing and Trojan activity. It contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to potentially harmful websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=milk+curdles+in+coffee+safe+to+drink PDF link annotation
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/ec8ng681n1huu0bicffp9kn1h0/lulojutudifozuworitixe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970419c2485---zerikiliranip.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/92974533049.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/95982509130.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/bovonigisovozideje.pdfIn PDF document text
    • https://ntwbearing.com/UserFiles/File/xuresatex.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/t08pel902j0m5afv5kssajm785/54032516038.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-18/20210618022126136797.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/tovofutijusaniwapexobavel.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d31b1b06---minegipowewe.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94fa7f1a7---52503997304.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/bimuxojevizuwu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b0vqgmk8uignhd8uc8o1c18e1/35328569670.pdfIn PDF document text
    • https://atl-50.com/files/file/zuwafovivenofotujija.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089171dc96e6---xiguwujipomeke.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/50798032215.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/1452851530.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2dda20d5cf8707e864c38936bac99f45/gozamodotumilidokovil.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e07aceb2e---80931594562.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097e474a43f2---97632307898.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083253564c00---nuwinafitunozipepu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d95a90516---43957489934.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/01849bc5ae7a63c4921784399ac79241/61187422838.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_off0000dc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC32 16288 bytes
SHA-256: 0923c98d2b855ed28c399723ca07b8a8e7a6a6403bab7ffe97cf39709c499e11
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 10652 bytes
SHA-256: 118d513ffc9245e74b49c0c1404bfe7f9dacda33dd2bffd357d84c9de206a3f9

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