Malicious PDF — malware analysis report

Static analysis result for SHA-256 6946d7908d6980d0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 23:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 083b4242d6b052f9c32816f78fb0341d SHA-1: 9a8ebf5c078dba132289b61b6cfac0666343a4af SHA-256: 6946d7908d6980d04d0b629a7eb1de81ac14200fa60663cef72426733e286260
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. It also contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://coretry.ru/uplcv?utm_term=by+virtue+of+meaning+in+english
    • http://lnshiyue.com/userfiles/file/20210529064629_178448346.pdf
    • http://vita24h.com/uploads/userfiles/file/xomawejov.pdf
    • http://jngf.cn/files/file/jojawidepeketidatufed.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6e4d4d0dc9---16127025709.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160cea6eedf405---27693153384.pdf
    • https://airshow-bg.com/file/tilopadaderefisola.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160701c23adf96---valasukami.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160a730031177d---7067698562.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/91606293801.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052830e580---67639517498.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/46954029465.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160be65eec1831---zutafexutupimafatitoreze.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9b8fc9541---mujonubedelemifadujox.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/25ef4238596824435fd0ee01bc9c63d0/todabasonej.pdf
    • http://alemotta.com/resources/original/file/79037723292.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4ff1c047443c3729c3b87ec62cb75b5/gotetafaf.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/c39e6b820370360fc3abe475c09536a7/13212120522.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072019f62a37---60160065036.pdf
    • http://dobre-jaja.com/Upload/file/xofotuk.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606da4c0df42b---45238022110.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/8572a918d582804010145145beeef07a/64762222603.pdf
    • http://alrabbancapital.com/file/files/lopojezuzelimobotaxekelif.pdf
    • http://musorcentrum.hu/files/article/file/gejunabawara.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ada0d10f884---11519376420.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cceb.bin
f6ac0ea8bb11cc4dbaa5320470b2036c49e9959d8ba6407a2aef985441cff1a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 17928 bytes
font_01_sfnt_off0000fc52.bin
6555a54cb22bc2fed17d64607a97fb43ae621096749e40064905978e5c8cf8ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10992 bytes
font_02_sfnt_off000115c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C0 16792 bytes
font_03_sfnt_off00012dd1.bin
650821af3f6c3f308df1056a817eb44702e18f716ad234841cf6313af3e0a54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD1 16968 bytes

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