Malicious PDF — malware analysis report

Static analysis result for SHA-256 89a0f5059768fdcc…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 04:34:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 85afd7d3c582ce70254c832b834b7fe8 SHA-1: 56d3f01abab1cb2b3712761a0b0dd9684c8285ab SHA-256: 89a0f5059768fdcc6f6a08e7d0f572216dbb958f6b5c191c797074bba7e0c013
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=how+do+you+write+a+statement+of+purpose PDF link annotation
    • http://annassteen.com/ckfinder/userfiles/files/buvavibive.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/10016388636.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67448802803.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1275aff5b1f9b3baa2697930f63a743f/18076738187.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/gizof.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/78879952029.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/sugeja.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/74882420636.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/bokazujeput.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/fc84cedf93187a04026b4ceaa1d99f89/52030181972.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210911_022424.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/disasazibelanonigixosada.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/67907727599.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/22120560734.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147f9225743e---duzamunuxufet.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/26065979788.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/20645499746.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/gobewuru.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/47e96efc8ec4c6bc26b6a586cf7470a0/78041660611.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/videdodimosefuk.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/rigopiwazojel.pdfIn PDF document text
    • http://platcometals.com/images/file/davadeju.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/senubabitogolabixafifor.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_off0000aeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C2 15500 bytes
SHA-256: 27eb8ac3675cea0a03dd6719b47318563559fd252a1c66fe6f65839344324e5d
font_02_sfnt_off0000ee22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE22 10904 bytes
SHA-256: ccdac10976faacafb75944219663d049fe0fef83792ff741694526ef6b29e0ed

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