Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c226d9b4fbf4e25…

MALICIOUS

PDF

88.9 KB Created: 2021-08-11 12:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48b9d681526c7cdadf16b32815e3e596 SHA-1: 354708886aaeb8da5aa00849df45b332d3c6008d SHA-256: 1c226d9b4fbf4e255b963917f16fd1a7fac9cdc8624f9dcace7fd69578e5a0e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs and is identified as a link farm, suggesting its primary purpose is to redirect users to other sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO abuse. The document body is heavily obfuscated and does not provide clear instructions, but the overall structure and heuristic firings point to a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://coretry.ru/uplcv?utm_term=donde+puedo+ver+la+pelicula+50+sombras+de+grey+netflix PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a60c31d4b---gonijid.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/zixefawufawezix.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/gutokelubesuguvefu.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/53747901757.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/buvuwuxugiludazilefelez.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/fugezizomirimimugifasove.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/61649778371.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/37643938518.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/zifuro.pdfIn PDF document text
    • http://abington1964.com/clients/865474/File/98863781820.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/34035532681.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///68105816672.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/86169855081.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722b2220369---pojebojowalelenanoziku.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f776751033c5618f8c3174f464e37ff4/79523861704.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0d0b2455e790844b4993b76d0553af52/74261402513.pdfIn PDF document text
    • http://immopolignano.lu/images/56971155427.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2acdcef80---87385330818.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/voxokoligixupubu.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/3533400305.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160745a5bcef80---4827303636.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/xigajafojimazuza.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fc28e6bdb---10921091292.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/zukonozomozosunonerepof.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/a64604165f52f945d26fa15d79f12980/baguwibunegoligozono.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_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 18288 bytes
SHA-256: 55b9f9b1646e744b26942cdef8ba50c201a5b16c289b131f10a92b9c14f5cd63
font_01_sfnt_off00011f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0D 11740 bytes
SHA-256: ce70791aed3a37beee27554b0c7a945a1c0b9e30214562177f2630e941e1c8e5
font_02_sfnt_off00013ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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