Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c3b9e5935d33aa7…

MALICIOUS

PDF

86.8 KB Created: 2021-06-25 22:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18eee71147acf90b6cbf5eddbfff5890 SHA-1: 6c74d128e0945b8b6fee6f6f7cdb3e29b9e3514d SHA-256: 8c3b9e5935d33aa780ad47f47103d4b94c2b69375cc723a27e94328b6ad6ae43
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e18aab680c7c7ec41cab8b57c005f069/5197423710.pdf
    • http://nutrisoilvietnam.com/upload/files/robuponukabamupinageveg.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717b43dcd7e---kubajirivare.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b918e096fa9---pubikuzip.pdf
    • https://fajanav.com/aym_image/files/dodurefelilakama.pdf
    • http://imssp.by/data/images/fxeditor/file/jipisogeni.pdf
    • http://cnhhgj.com/upfiles/userfiles/file/55021189523.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/cd162ef862d3b1a5c6551920f7357cd8/66946864339.pdf
    • http://aarogyamedico.com/userfiles/file/57515706573.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094232ebc8df---85555952907.pdf
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/57918912285.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d51658ab1a---96107048883.pdf
    • https://aviseco.ro/userfiles/file/5064586632.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef614d5aed---64089167686.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160833c8f22ce2---xaxutele.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c91d4377e6c---14782367674.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d578d5e7f---dadolifofejimotaroges.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/pu3vm169qhmpb366p7i092spv1/lemiwakufowolekonotune.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/cebb27f6ef360916cc64f9a5fc9d7ed3/tunefinulolofofixerub.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160968967d49a7---penakivurenefotoz.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62ba42cd---xuxesubimaguxife.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f51fb91b9---kipuwinovomanuxosazagiw.pdf
    • http://yuha.be/_files/file/dukutemavaz.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca0b6c6e26---mejajibenufelafutujaveg.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/8aff5986a8593602b7b41e1f31aeea5f/suzuxubilisaberananurumir.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdf
    • https://ludifrance.fr/userfiles/file/witamu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+outline+for+text+in+photoshop
    • 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_off0000f0c5.bin
f17028c19ad03724083373e631aaaefb33968680e19889450bfedd43bd28801c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16704 bytes
font_01_sfnt_off00011c40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 16792 bytes
font_02_sfnt_off00013457.bin
da38b4b3d5b47ca0a35c6b747d5ac8c19ecf9fd2bae43b409ac230e591010d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 10996 bytes

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