Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0bb12d91e91b064…

MALICIOUS

PDF

84.5 KB Created: 2021-08-27 20:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab76bd30e7487184e4d175cc29433f13 SHA-1: 20eb64eb84db41a7f0bfab54844e5a9b9e49b530 SHA-256: c0bb12d91e91b0640a4c27f681cca7dc3960f15e7ea12c2f5348cec1aba805b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to external sites, some hosted on compromised WordPress installations. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, suggesting an intent to lead victims to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=split+a+single+page+pdf+into+multiple+pages PDF link annotation
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d6a5d8b8dc---11186027525.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/63731115807.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/voguvixu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/33542d02b557cb248549f0e044e087ff/xisafewazalefixalon.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/12869782045.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/maripipapunuxunavopi.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/sugukulesi.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uuecl72tarkugc158a3s6u7b7f/mopopitanud.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16074b324b5dc0---85978481515.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/71056200845.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hpceugt73fl1aq6rc73oqqldcf/lodadupomufuwirunukajeda.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/tuxokojolopemowisibo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/fned8ngnil9s8fbrr8b76p36g5/towavipusunusovitolivik.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/48059762599.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/xolonatemuri.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/941775935.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c70870766---65190401444.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8ce4debee---xexupugeriso.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c216cd42d---56075436066.pdfIn PDF document text
    • https://artenika.pl/fck/file/88789067209.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/43619196032.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/xevinepopojawulomesorek.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16107e9e999a8f---19335888045.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2d969763d11a8455842fdc10b96f2e88/59510766222.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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 10916 bytes
SHA-256: 1b9420e2898bbeb8b63d7f0ef0aad214f76ae8187a0e0777576f71a842728171
font_01_sfnt_off0000fc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC57 17716 bytes
SHA-256: af0219f4d361eb13dbed46fbbd40740000c8051fdfb2d65808802b486d07b026
font_02_sfnt_off00012b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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