Malicious PDF — malware analysis report

Static analysis result for SHA-256 f85c73add13cffb5…

MALICIOUS

PDF

84.0 KB Created: 2021-07-13 19:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: fa99646649f4f35829a8d664a699f47e SHA-1: 11fef3de7dc2053aff87bbf0a509ab0b52aac528 SHA-256: f85c73add13cffb53251603eed7034d02f74c5b56f4baba49102a631244a60d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, including those hosted on compromised CMS uploads. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://mobilenmr.com/files/files/27422094090.pdf In PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e9636c304f69abc78c9fcc96d5a1ea41/rabinibixezosevakobabivad.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/41271907403.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/53176706538.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/75373489621.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089707e082c5---45587215199.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/xutikufugazokaxebozaxena.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/dosugafewirumotovenuviz.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608170580aaff---vubasav.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2dd6bf271---70037599300.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/97824137922.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i507enqt8tee7tp30nmcb0k116/71463782275.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17aab4fa2---27011193274.pdfIn PDF document text
    • https://kildevangen.dk/files/53250560100.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/wonavenogudololuwumasiviz.pdfIn PDF document text
    • http://snsi.jp/image/news_file/sejuzufakefavikipamidel.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ed5da121d---zamefed.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/78d8b38b9d79ff0922a788895db6eac4/duxufefixuxiw.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/120450574492.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d224b803770471d80ad1d2a6e87aecbc/44197706455.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160815e6a911a4---zuzalamemu.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e6f61638---16796903651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=kings+county+divorce+recordsPDF link annotation
    • 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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC96 17544 bytes
SHA-256: c7348c1b3b01c3754b823d7136e503f6251d4b6b510c82b8ac2ca3c9de6564bb
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 10608 bytes
SHA-256: 5a5370bd6bce80eb9775484e22b432fe6a2743861fd535a23df187179b67ee15

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