Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3a3b2e8dabd838…

MALICIOUS

PDF

108.9 KB Created: 2021-09-07 05:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 845186da9e0e5c2acadd633d70708f74 SHA-1: 226040acae8c2b460c99f1fd64abb8c03aaae52f SHA-256: ad3a3b2e8dabd83846062b4c6a1fc6d7f05f8e91277302c7ca1900b61ad53d99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript and the link farm behavior strongly indicate an intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 7

  • 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.
  • 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://moristas.com/userfiles/files/wiruga.pdf In PDF document text
    • http://nordicaluminium.ru/userfiles/file/68035927390.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/temigifolareperejobede.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/46539229280.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/53503623278.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1adb94aa82---5492841664.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccee3d963e---rawikadumujuwozadokobi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/sapokinipugurakuwal.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/30743029644.pdfIn PDF document text
    • https://matratva.in/userfiles/file/nenaderaloninenosakedipi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108016429eeb---jaraja.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/77407578587.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/43259879346.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/104034b15a6331d591e553463fc8e467/joxenefo.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/2168637300.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/tutewosulefisenuwuropusiz.pdfIn PDF document text
    • http://vodnik48.ru/content/file/74042010971.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/pht1o24i2lp4q7441gbibefsj6/jemirikevuxepidamuge.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/29090149468.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02a3d368d9---rikagopewilisotetobefew.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/jajedupime.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/b311848tsn7icbs0opboo44ma3/40043690722.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/oanpnklm5vo9njjou93dk6b27h/nofesujedivorokoxixipiva.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/9o7b1jlm9dif4qom6eidmv7bh3/lapotumamifuwokalude.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/f265bda247e8980a962218d1a9cde897/tewejefadadenotelenopaw.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/5c7177d37f8f502e33bf6c28f6139554/vedojewipupavewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+to+text+python+3PDF 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_off00014223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 19740 bytes
SHA-256: b0b1950c6652374f4acf33cd003cf0fbd8babd22dc18cc2768ff984e6b6bd53b
font_01_sfnt_off0001761f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1761F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E36 10416 bytes
SHA-256: b61fd9cff8b8682c3d1ab57a557042a1d5884f86c203d885ee6300ca215d491f

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