Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b27c787c364642…

MALICIOUS

PDF

70.5 KB Created: 2021-07-01 10:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e67cef5dd894e765da542e75a842913 SHA-1: 3ff6cda6a404b98a937bb3909b6c6c8842e87d9f SHA-256: a2b27c787c364642a4b584d19d8e00bca668df7b4d18d215b76d8c9ddcf691fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to distribute further malicious content or phish users. The presence of external URIs and a link farm structure strongly suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://auxerretv.com/content/public/file/45523488480.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8m9vnmemgivjrcuboqj55pr2s4/fiwunixinowujamidalarufeg.pdf
    • http://ridendo.cz/files/file/ligebajewixifesixil.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609e116235e68---nagubekitefararepejo.pdf
    • http://iwishop.hu/file/32472085780.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/7bc7bb8c661437ebbde61de4ad85e587/55806532260.pdf
    • http://jadever.vn/Images_upload/files/xezujuduvekodefeduzikolo.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g3mpjhpbnvjjvdt5ogh36t8r6/sesefemuboraton.pdf
    • http://jtour.vn/userfiles/file/61190982501.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8aac573a---72697113264.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7999fecdcf---bujikabiwub.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/34db04f9687b4356c4d552683254fc8b/74549362557.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/r96j2an5pnh25mp646d3c2h95f/fupefemululireto.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b83c4aa7---89091116658.pdf
    • http://doo-san.com/userfiles/file/20210523144615.pdf
    • http://chennothinterios.com/uploads/file/47922655648.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fe9caf7ce---44131378813.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082c682ef677---56433893918.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/08de9dc82fe48f5c54f8f68e9330b566/51842053726.pdf
    • http://circuitoinsulargc.com/documentos/file/76788564096.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d64f1cef20e---juzomidutijaxilamexod.pdf
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/86284869679.pdf
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/ujptqj7j9p8jtq7tu3umuj4p01/vopubuwunefa.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd4de8ecdd---fegeri.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765d033bf52---44522093689.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=willow+taylor+swift+mp3+download+free
    • 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_off0000b62a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB62A 16792 bytes
font_01_sfnt_off0000ce41.bin
ea55158d61e45fccc963b33794e7705cc135b7de838b0dbc48c61bee3e494958
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 11024 bytes
font_02_sfnt_off0000e7f5.bin
4baa13476720babd66c69dfa9fc9807a69141a81b61b91ca41c68739c4098242
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 14444 bytes