Malicious PDF — malware analysis report

Static analysis result for SHA-256 352dd818ff7d4361…

MALICIOUS

PDF

75.0 KB Created: 2021-07-02 11:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9e77a1aa03e8a7711b41059e16b7ede6 SHA-1: 93ccf8e61b77f4e45b9f239a783150c2a43716a7 SHA-256: 352dd818ff7d436154d91fd2199a3696294885e77bdf33956c743c46a427fd01
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or serves as a phishing lure. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which in turn host further PDF documents. This suggests a multi-stage attack, potentially leading to the download of additional malware or redirection to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/bg80kkf9c8q4sva66uku3qhbv2/41405935530.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ed4d61f6a---75704927269.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9dd3ec9174ab32f7b5f0461ca8e4ee4e/85393641400.pdf
    • http://a-daily.jp/app/webroot/contents_img/files/70218012696.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/861e6aa9a5288860c54b768ad3947dc7/rulowemazilimevajav.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b441cebd4972e0964194e36f9135bc6a/lafobiwozaxav.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087621bee85c---siwonajupumemurix.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e7855e38dffde25523fa2d9b64d9287c/jobapanemejevogudipuboluz.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160745092d3d56---87702776096.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d8acbdd970de871689273fe56a41dbde/61915741447.pdf
    • http://chemonova.com/FCKeditor/file/25667882983.pdf
    • https://clickkedai.com/userfiles/file/temilonerijopag.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/ffa32bdf202c34cccf68458a02f6e5ed/72603740849.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085836edf13b---wofaj.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/8d526537647c322cc109e7fc81ff1e4d/xololarux.pdf
    • http://beerskiboot.de/img/upload/file/39560535595.pdf
    • http://modnyi-buket.ru/uploads/files/wijifi.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/38769414509.pdf
    • http://fosterfreezesantarosa.com/uploads/files/junojug.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/alahr416cdn6092gehanjsp00p/68293349977.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e73b44f56e---wewimavorunimopovamo.pdf
    • http://hibertek.com/image/files/20210622_131356.pdf
    • https://imagebuzz.net/ckfinder/userfiles/files/41841723750.pdf
    • http://asokmontridental.com/userfiles/file/71721335094.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd5e5a700e---59592195877.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a0f1319c70fc8479d23f4513c0a28055/gemipokomak.pdf
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/bc79b74da92572890614acde35117a1b/fujelobewuzarexipu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=temps+today+near+me
    • 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_off0000c494.bin
574630ed13368b25c7c41854286ffcdde077d7d48f9b24630e943573c55ce8fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC494 10492 bytes
font_01_sfnt_off0000dc79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 16792 bytes
font_02_sfnt_off0000f48b.bin
01e6c825872678f0401a4a72b4aca35f90820d37f90d9fb17ca16e0dc3ea680c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48B 16128 bytes

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