Malicious PDF — malware analysis report

Static analysis result for SHA-256 3982ff8584aa81ef…

MALICIOUS

PDF

87.1 KB Created: 2021-07-24 23:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 548dd0f9142d5fba46f75ac0b203df52 SHA-1: 0e1f81cc10515e509623d09710342189e5bab0ca SHA-256: 3982ff8584aa81ef5816870c3d1e9ffc885ceb6a590cf70697f8c4c9be0bc3db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fbf9d1e6---47633832332.pdf In PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/tizarujajotivozit.pdfIn PDF document text
    • http://omg.su/upload/File/nesojovizerobafupemino.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b680cf926---37792941793.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/57334070293.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/95096690b5fc7fde0ae76334ae8bbc4b/xagefutowegefuxunep.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/bacc6669457633bf1038ea9420237bd1/vujaxolul.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/metozekewuga.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/49566900046.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/67561843418.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/73588595124.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/e5uci0ffpn29uq5veleeb5c8fn/vugikogorabuwaret.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/n592qgeteff0m3f7eu4eh9vg9t/73722306253.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sebv50eic5fdsf2tdrqa9hb1m3/tanalusebujof.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/39379127403.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/dititawomamimasa.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aabe83cdbc---pakeriselepefaga.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7894b804c253b358bab5e48d6703a930/55034454880.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/wotavi.pdfIn PDF document text
    • http://netflor.pl/upload/File/32447003814.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f69be7e757f9502326a61932dfe0aab8/zilaniramurekazorib.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/legegilojosixine.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/91fb6bcc7c36c4dd297bb94bf343b0a4/jojikezebetinolut.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/7hsda16d4a0cp0q3ao7pusjemu/bugebinosoxivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=formal+letter+format+cbse+class+10+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_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 17408 bytes
SHA-256: c332767746e8d2dba51ee86db5768d2b70465cbf2c6f3bf78d200b62d3073fdc
font_01_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001347a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347A 10876 bytes
SHA-256: 864e6817c23fe3871ec76620a8206611ec9f84d9ca171fe5bc0e5feb7ba29950