Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d86f4ae79076e7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-01 19:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 79f28845c9deef3d5bd1519e8c24b535 SHA-1: 462ea8d4d6eded82bb417f224b76b11dbbc01312 SHA-256: 55d86f4ae79076e7f87a6ce1de7c8ee63807ca7d7b0d098c97014b624c6eb033
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to direct users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=graveyard+keeper+inquisitor PDF link annotation
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad051c3f8bc---63882240263.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070501152543.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/90659895108.pdfIn PDF document text
    • http://orthopediedelft.eu/files/xodek.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090283b3a98a---donogeg.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/fowarefuzusige.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f7024678---18061233947.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/adeu98pkiu6ligrronq20tfua3/ludup.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/20822117807.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/34258457012.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4debd0c4db---6315019886.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/832c08dde0de5d52a53408cebd9acfe5/61965510241.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vosonenezesojuz.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/bumukukaxirekerobojutu.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/kunudamanarafog.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0e7abdbfa---muridovot.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/58646332898.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/rododofobavenir.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9f3e06c---41879432978.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/dsuq8u82edakn3db3mruhgia84/30373845069.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/845331b7991f9a04789597864d040cbe/virasekasexabemebopu.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/mokafaz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/68195144568.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/24204371281.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c40f01183---visafulorer.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/e42vlvg458npoqte0kp1tilqal/goxugop.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a08d8b5c---29685340929.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_off0000eb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 10896 bytes
SHA-256: 93f96d0f861fa4be29228944542abc71573f29f1fc90ced69d80ac32e98481a3
font_02_sfnt_off00011c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9C 17456 bytes
SHA-256: ebdf23d97452b28fd14167d91a2101195a51a5681ed2ea9b15da0a4b3f9420d0

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