Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1caaa4d088cc69…

MALICIOUS

PDF

77.0 KB Created: 2021-06-25 18:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 019f83d5e69b81bd4f8de51875b3e8a8 SHA-1: a7c09f833243660d40655b26d46a13bac21a69be SHA-256: 5c1caaa4d088cc69bf63f384774a6a9d4b3931b5e706afc01f1fd8444b3153b0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/9140d963c961be5636965cdfc8eddf1c/19658105217.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a516f32ba69---74808545032.pdf
    • http://blueyee.com/upload/file/132154456502.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dbc798f9c---1220247456.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2afba97fd4---78537464290.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/sh97rauu6k85gu6mtiqbskhvcc/43920225520.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd5daa250---2269562709.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/8b6dc2998088463e0d8c3af87077ff60/8633171608.pdf
    • https://censcakmu.org/board/file/files/82222530879.pdf
    • https://x-software.cz/data/file/wenagakepupawuzerutilise.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a09e54fbbade8d8df5098b2e0509b522/33136978088.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091e315e45be---gununanesajifuzeminugaru.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1c517a9e---81060939333.pdf
    • https://artbynela.com/uploads/file/kilawodabanumoxetexape.pdf
    • http://kameleonhastanc.hu/files/file/67391290421.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/69316878884.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a38e403373---81038913238.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/81796249273.pdf
    • https://theatresaucinema.fr/uploads/file/71677153183.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/42414856392.pdf
    • http://pinzimoniofiumicino.eu/userfiles/files/rinimelafobogerakusa.pdf
    • https://vandolderskb.com/images/usr/dubuvod.pdf
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acee478d35c---56775402488.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e672ff4b391e6a1b4a724aa1d0f4e6e7/kirudiminefufefakugo.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890d337bfc---wamimitojomabugulif.pdf
    • http://frangarcia.eu/upload/file/78896697468.pdf
    • https://atl-50.com/files/file/11744694776.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=weymouth+police+station+phone+number
    • 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_off0000cae1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE1 16792 bytes
font_01_sfnt_off0000e2f8.bin
b5031c17e85147d499fe6ce33276a0a0eb65ed5ee6f3de1b3a70ce0cc4f0643e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 10984 bytes
font_02_sfnt_off0000fc13.bin
05002f6e021b9b5c2775739a0383adb8f72ee765b7a8a16969e6b4376009416b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 16412 bytes