Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ef21903472f17c…

MALICIOUS

PDF

87.6 KB Created: 2021-08-13 19:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 41f014ec8a78148152df3d2e63a3bb52 SHA-1: d820f615425b5ff3845dde9fb422980b2660b538 SHA-256: d1ef21903472f17c46d71eff520e6f9964906c4ce2db2799631e611bd1d2f7af
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download a second-stage payload or redirect to a phishing site. The document body is heavily obfuscated, but the presence of PDF_JS and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://infrive.ru/uplcv?utm_term=final+destination+2+full+movie+in+hindi+download+filmyzilla+720p PDF link annotation
    • https://hoavily.com/uploads/files/zoboroguzonexugegotuget.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/30058178280.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083833d29965---womixesosune.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/wizizamo.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/24540721865.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/52613843508.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/34292024431.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fd9f471bea8cfbd3aa1a84001fc99eb3/vefaxiranaxisusifovi.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/71936036540.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/83099875753.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/barizewanotosiw.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/94c0fd33c7334627385aac355ff0be65/61275940313.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c694fc95e7c---sefibubeg.pdfIn PDF document text
    • https://ka-base.no/images_content/file/gurezokurizuvitinopofokil.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/vokefowivujetameniwuwinab.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa3db1b93---libatanafe.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/85838223901.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/47211208446.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/23675775802.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902fc15f5cd---83558751055.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i06992bmdd7kvd0kd9p6vk1u7/buvifus.pdfIn PDF document text
    • http://stevis.cz/files/file/sevigusebis.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100f65d7dbb9---82305753378.pdfIn PDF document text
    • 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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 17244 bytes
SHA-256: 0064d2329c916f6bc8ea12723718d7a252046a8282ce2992c9749a609f11e5a9
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001350a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350A 11360 bytes
SHA-256: 72fec890937345592531bd0d2410d4d8c8c9fa3bcc0501d11133e4e93598293a

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