Malicious PDF — malware analysis report

Static analysis result for SHA-256 56cdce044e41d3ae…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 01:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bcb023975361778eacb681092fce757c SHA-1: d072a9ee12a37cb44c4ed721f1feea0d82d64143 SHA-256: 56cdce044e41d3ae4ac7ab92e82ad8b0457fe17a8d441c35cb0b3dc914b145d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://chcial.ru/uplcv?utm_term=how+to+plot+exponential+graph+in+excel
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/eeed15f859bd0b964e86880417d711b7/44005698193.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d6ea16fc368a62b46763bb2688e3e93/44234463817.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c62eb4bb04---90944227704.pdf
    • http://abwingsbuffalo.com/uploads/files/koketemuzubavabu.pdf
    • http://unseenadventure.com/userfiles/file/xipulolivivunivoxusa.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e923f35a7dc61f67d967aa1a01c38d6/36986804200.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92aaba5197fc82f8cecb4c0d69233556/pezafotozokedemigagagef.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/11095b9223aa4dcacf7680511693d35e/61396455375.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/b3e0faa69c950a35546d430ae43cb77a/92992087205.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607b305716955---lorinog.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079038955cff---fitirunuzetegerenogefumov.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90a4dc77e---riket.pdf
    • http://texmet.pl/userimages/file/zujuxojixekabodipuzule.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd0cb936c1---fuxigigetefijozok.pdf
    • http://hyundai-dongdo.vn/images/files/kaliledubidajetifebo.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a4c8330825cd08dab47a7c268a074584/41288751271.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/xikiwezosetonupawoxalewij.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22e8d99e1---buxirewiwozumil.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f0aab1185---jupuwowugamowubaf.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/54767680118.pdf
    • http://effektfilm.de/files/file/kibotobuniwuxomokejimev.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094026e36981---90335492013.pdf
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/25645102229.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69d.bin
89d76f287e4ad37aeef152602635c3d315c1ec74fc23836eaa000da8ee8bf261
pdf-font-stream PDF embedded font (sfnt) at offset 0xE69D 10664 bytes
font_01_sfnt_off0000ff01.bin
6c5058598e78550d51400fdbf35fea67ba4c39683654b4c4cb73070fee0e790d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF01 16824 bytes
font_02_sfnt_off00012b04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B04 16792 bytes