Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf72e2ef650f2f1…

MALICIOUS

PDF

147.1 KB Created: 2021-07-16 14:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e86e410b62a38ed33e8bf0c1c79e3a0 SHA-1: 086831d73b94d25f5519bd79b4382f819777d608 SHA-256: fcf72e2ef650f2f118149abef5dd7f625dac287f73cdf538866d4b58012340a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbe6e3ba1e---pasanawo.pdf
    • http://arebiatours.com/uploads/files/90780746140.pdf
    • http://henca.com/files/details/file/xebesojijuzuvudem.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160812e7b36944---xejuvavodopebetatoxozewa.pdf
    • https://sportsht.com/userfiles/file/manikiwulelowexopalemi.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8f35d1g22qbkv81s9tl8clq9k4/zojatiziwe.pdf
    • http://terredellamagnagrecia.com/userfiles/files/37362865346.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/67a15cf9323f97128434e70a7bca6fd3/69196956149.pdf
    • https://codecs.ro/images/file/15180056615.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afa719c713b---lafajuliv.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d78a38ca---21297479953.pdf
    • http://innovatepc.com/userfiles/file/49490181985.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/b10ec0290da61a405768519254611c36/77352053300.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e13d34c5ea8---vizomodozaro.pdf
    • https://windsbs.biz/files/file/40120168555.pdf
    • http://rapabzenec.cz/obrazky/files/48974044127.pdf
    • http://sacoorhealth.pt/site/upload/file/dotejewizoverufazarukode.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce6947bf8e---muzakidonon.pdf
    • http://aylincinarli.com/fckfiles/file/93899030958.pdf
    • https://elminhaj.org/userfiles/file/76387309034.pdf
    • http://alexandercdg.com/clients/36029/File/jatumobof.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070f2781b85f---68087330873.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=five+nights+at+freddy%27s+1+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e122.bin
de5c17e477b831eee513647e2c3e6c7eb16e7f72382e7493c3ca3889df243d38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E122 10712 bytes
font_01_sfnt_off0001f98d.bin
bd0f401ad0c58c71da8e443371660cde9df15375956120fe31d95b115fcfc8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F98D 17216 bytes
font_02_sfnt_off000226bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x226BD 16792 bytes