Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeafb5f98d643b55…

MALICIOUS

PDF

87.6 KB Created: 2021-07-24 03:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4aa2288661e40de6772d0306e8f10e8d SHA-1: f228c3ba18d28fe9eb9990fd4ae47730dfac3bd2 SHA-256: aeafb5f98d643b5582c34f518576259f155a37e3ce0140b6645f60dd522a4a10
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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/160a0650534b1e---lixudimejibuxemiboz.pdf In PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/nefovifumimurusisanatoke.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7be35eb638ee534c290bfd3a4bad12da/38465151032.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da282ee15e1---fagug.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/nijisufulexixaxoloxup.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/fe718ac7f05d551d369121742f46ba56/92848525166.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c21eeede2b0---7963013873.pdfIn PDF document text
    • http://npas.ru/pic/file/zaroba.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/18409161718.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/xarokuxowatujerilijakesu.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/zamobalefumufunimawa.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/27383046729.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/baxatetideginudi.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/xomizemozawagutanil.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/gutapisunomolon.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af97b3b2f33---88863457192.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/dafavu.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609924b52b9cf---44732482393.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/16697251069.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d636484011ffaa9f3bec5a5a1f22ac09/34743291083.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/10296940688.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jhuju6tn3jrcqk595dorlaa5vr/fepilonagifijijuvup.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/47471131979.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/61f79f73fc03aa1f59a0043def8d89ce/57812085673.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/99708241330.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/13030234632.pdfIn PDF document text
    • http://holyfamilycyo.org/clients/37654/File/31868121518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fechas+partidos+uefa+champions+league+2020PDF 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_off0000f022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 17788 bytes
SHA-256: 045302d4f8a3c6198786a50153f32b7b9445176871a7d79163d2e502c64fb66a
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 11388 bytes
SHA-256: 3b624b1da809a33b7a8877eae238677d247e10b91d38655cfd7cf733339571fa