Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ff572e4e60d88d…

MALICIOUS

PDF

92.6 KB Created: 2021-07-04 17:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 9c6683d18cce88d39fefa5aa1ec05045 SHA-1: 5b46cba8c209ea08ab081950f458023c417d4df0 SHA-256: 72ff572e4e60d88d6bfcc797e7bc6b980dad14c20c8549b500bda51b891134f9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, aligning with the observed link farm behavior. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf7db138ea---50731937700.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/sfqa0qs13ul8rd0qoqpjujncij/15803736856.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vonafifudutodexewenuf.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/degekozegebuxapu.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/f66eff5abcb90b4d17cbbc0b30411206/najuji.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a880579876f---gopefolodupenudoviv.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/cus6152ii870ucsgtjkevat45k/59199159572.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1a1c4d928---32545505761.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/nenizudaseve.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0bdbbe1d12---47652520635.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/qtbmei032a1r32j10o6s7jvdj0/wemeniveseke.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/25781479776.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/80927456388.pdfIn PDF document text
    • http://viettranslators.com/webroot/img/files/tavejub.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077750ecd95e---1202336040.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3029dc3c---fizinifuwerazugi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9067bea0---36303036254.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8qbdac7214n3cl8vjepsfuae9j/99612949729.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47147bf99---bozetivujuxogiwav.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160818deea67ad---25523684724.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/kenejuvolofilapilo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2837188d8---ledubatununow.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b0bcd513---8567746899.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/95166619719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=where+is+314+area+code+fromPDF 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_off000108bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16668 bytes
SHA-256: 789fd585adb954894f3b19c61280cdd02b3ce5ee45f9c2c2b4bea50f4dd0ed21
font_02_sfnt_off00014bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF6 10788 bytes
SHA-256: ec589f0c7778ac0701228773f64471334ceddb208582e442af798f15fdaff8aa