Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2da7d043a50ba38…

MALICIOUS

PDF

85.8 KB Created: 2021-09-08 10:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 02d8c31e85d08f2096e03d9cd0e76c1d SHA-1: 98191e031ee31110a0f5034934d2e98d23b987f4 SHA-256: f2da7d043a50ba380e598c4c752225a262da09630896a9d24e757f7c096c9d7c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with link farms or compromised WordPress sites, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://kaies.cn/upfiles/file/47127289597.pdf In PDF document text
    • http://sk-uralstroy.ru/uploads/files/55101326442.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8b1274c3901b9f0b01aa5abd84d64162/muwesasezataxa.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210822002237.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/6f0f6e46c3b905c612235530d013378c/lekifudasabanom.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021080302445255.pdfIn PDF document text
    • http://qdjshg.com/files/file/69941730040.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nuderafofitukigu.pdfIn PDF document text
    • https://atlantidegattico.it/file/67949881977.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/febobomepugugenexebebosa.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02728cc1f5---74516137024.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/nugixonuxabepedogevaf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efb3f4a425---minejadejebakuxidupifovef.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/mf4mtj0j71po2b99d9jiat775n/29683102970.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/728d14e8468592c100abf38326117525/goliwotuf.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16082a98bc8e5e---wenumo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/29515428ed1369ed3b6d6016ac9f735b/weviwilowikineme.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bf553145f---lixufojagewokasevetuti.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/mibokupuxivezoliwepar.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/xubigemusug.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/14khmrki25jecamo3cp5ppp3re/dexudusasujof.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/37e426633e177376a3029120744710cd/bazinolamuwujapimusubu.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/27762954890.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/fokopodaxuzekilajaluzedu.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/40008861940.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/tufodoxujapuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=mercadotecnia+social+pdfPDF 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_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 10608 bytes
SHA-256: cd725f058438e048c83c50a76906332f37492438c67b90d57a490b8a72e7c4c9
font_01_sfnt_off0001016c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 18676 bytes
SHA-256: ecbe0d0a1cc51983ae8bf878f4f8b5093be83d85ca3a3ea448c4442580f35b71

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