Malicious PDF — malware analysis report

Static analysis result for SHA-256 20293864acfe1ed6…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 09:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb5763b27bbfce2439a37ae6d4b9b9f8 SHA-1: b42d6552e0acbc564cfb236f5791f4f74b786d0c SHA-256: 20293864acfe1ed635a7b35728b0af5f0a2967d45e727ecd4e0d73245c650464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to various domains, many of which are identified as link farms on disposable hosting or compromised CMS uploads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO poisoning to redirect users to harmful content. No specific family could be identified, but the techniques suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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://giovanniseneca.eu/userfiles/files/vujawinuvolo.pdf
    • http://placc.info/up_image/36558015801.pdf
    • http://www.grupoaccs.net/ckfinder/userfiles/files/2394677172.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36828625a---fajegexenipadeduj.pdf
    • http://vanharteyoga.nl/uploads/files/wegepawogited.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/54272633170.pdf
    • https://daiichitravel.com/uploads/news_file/falisikeximotupap.pdf
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdf
    • http://bmcnx.com/userfiles/file/rajarurugegak.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b09b272938---gewatulu.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac911ca4d---javexelenobikaz.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb12992eb9---tofotituzejavog.pdf
    • http://curry-box-deluxe.de/userfiles/file/xiwopixoxegob.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9408c1c2e9---40461001595.pdf
    • http://mispuntossaga.com/campannas/file/77509858118.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082204301c3a---vifevub.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb886d483---majefalakiburimalenuku.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eceb4d87b0---bafiw.pdf
    • http://netpost.vn/upload/userfiles/files/4725606774.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608902b656ece---44612677163.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3a36ec2ee---62973913868.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f506a78ff3---90989811943.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=worksheets+for+first+grade+writing+sentences
    • 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_off0000d2a8.bin
ac3809588e0aace3c7aa51e6ed9d0c249656c46d384fedbc7a604a3c09eb7f1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A8 16992 bytes
font_01_sfnt_off0000fe7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7A 16792 bytes
font_02_sfnt_off00011691.bin
77d36276b9ede88aeeaf1f51807da075b271e2cb4259b14aa59cabcde006ce68
pdf-font-stream PDF embedded font (sfnt) at offset 0x11691 10880 bytes