Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac10fd434749c1…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 19:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 5c73feaed349a2600ccf09d7e2712345 SHA-1: 24ede8eb0b80549e7f0ce7b054edea30882df68d SHA-256: 25ac10fd434749c18f336b3ee50e026973ccba226928c6bcf1466e03cb2686d5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079793a8bf55---22755335942.pdf In PDF document text
    • http://hongphuc.vn/userfiles/file/15032907170.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/13588358547.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/busoni.pdfIn PDF document text
    • http://cloverpark1959.com/clients/51168/File/fibepuwu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/vghj2jgtbd7g6p0b1inlchq0ha/67119621305.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c908801814---tatigurelofulo.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/8957984800.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/rukufit.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/12089938669.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/32695274471.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pifogot.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/45t9t4efqi2he19q4av8uo0eml/95857347266.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents//files/99893277862.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad75590ff2c---wobemufopiwolikumet.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ab3e7f51651c229bc276bd966e8ef333/kenozetumisekinafuzefa.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/bukasale.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/d3b5ef1c443c874d8948803311b83bc8/72013909019.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/80315813355.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99351bc59---kajujaw.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/bifotij.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kubenukumadurowivapaga.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/3893879210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=beauty+and+the+beast+movie+torrentPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DA 19700 bytes
SHA-256: 3e516942cc01bb126ec5f97f1310f18187a7ffda1409a4a4a6254da7fb724efa
font_01_sfnt_off00010a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A75 10940 bytes
SHA-256: a0266b018a851e5d0fa98038c4155f3efaab627011976f8dc698a65f1386b8db
font_02_sfnt_off000123a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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