Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbe265088ab3270…

MALICIOUS

PDF

134.8 KB Created: 2021-06-26 08:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e2bb6107998a7071a4804dcdf0524a SHA-1: 085203c9d1863e749b20e39a95b0f7e84edad964 SHA-256: adbe265088ab327001791864ee64354775695b27f85558a3a4df05c2d77b5ffd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which are hosted on compromised WordPress sites, indicating an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9310

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd795169c---tewimawadiwit.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f7b5f027f---33607293380.pdf
    • https://najlepsze-w-polsce.pl/uploads/panajedotegakozovixuro.pdf
    • http://vitalchurchesinstitute.com/files/file/wewobaniforaroredubelebov.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072635979183---polasojemegi.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd14bb9b656---jebujugajida.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608184e54af87---56732249589.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7722462c4---29581429167.pdf
    • https://gaziemirkentkonseyi.com/upload/files/12132856948.pdf
    • http://dui-antidote.net/images/userfiles/file/kogurelefesalagikul.pdf
    • https://businessservicesuk.com/userfiles/file/89207381367.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a747a3af8c9206d38af433b7a18b4c21/nevaluwiseder.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bea27af7f---74473615695.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609877ec28509---vufovigotusejidu.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a018b25523cbbf498a328cf15aa336f5/95106813522.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/55246405825.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/qbqg84r7rvv4ikcltfjcq2s057/3151668136.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s3kc88o7mmo9u6vikkedcammk6/sejogupujuxez.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/280dbdad01f87e25364285208e0e7f66/fagazavuwubujutexepax.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7adhfo1o0uqaljaee7tiro1fe1/65781825816.pdf
    • http://homestationrealty.com/userfiles/files/vitojapota.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b2500346c9972030791f8f6a3131427e/95869261614.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d74e67ea3---mifusuxutatupun.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a561013b0---bikabogukikomifulagaduw.pdf
    • https://renault-service.com/userfiles/lisawedugamumepokur.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2319ede67---zesowejutamezoxovubu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=least+mean+square+filter
    • 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_off0000f8f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
font_01_sfnt_off00011107.bin
8d88e5ba10491635aa748b1a41ffa97fa77d0ff31e5b57af99656303a361414b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 16652 bytes
font_02_sfnt_off00013c83.bin
d809d5124926919a4bb4634f5affd0d4e618eef2e6b1bb97405db02f43c68c5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 10456 bytes
font_03_sfnt_off00015424.bin
34102e0a5465f6987a867ca6e860078d730ec8608e1ac97c0395426e63b5e0f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15424 72156 bytes

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