Malicious PDF — malware analysis report

Static analysis result for SHA-256 e275f0c2336bc668…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 11:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 43da7b2b3f3c441e97dfb5aab52b2a67 SHA-1: 7565a1f2d0860c4bc10031af560566126db51753 SHA-256: e275f0c2336bc6688a2053fbd932a1e483ad09e1121db2227e9f05a1568ddcf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b6c7180b---mavuwexeko.pdf In PDF document text
    • http://abwvictory.com/uploads/files/newikivuribupifolulazago.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/masigefopiwevoj.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021070611441017.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/25765779257.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c11b5d05---rogevasesamerereviso.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868f86436a---gajugivezunoxa.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/oi4oua8gfdrt2k3ttmvvhm8o9b/83246150632.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/86626470410.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/74567330616.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210724023622.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/81677689914.pdfIn PDF document text
    • https://avenue102.com/uploads/file/51997710991.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/vewajuvovibojedepimedale.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/guzedigodumun.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/xilorejakefar.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee636d3e8b---80568821774.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/jujalofevafixaxu.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/vazizivota.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c963b59de11---kubuxexaxuxutojugodadif.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2ada8672---xipopijopepepatulujutir.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dfcbb4c157332ee7e0a49ff0e399072f/tezijerudedamijosebe.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/2fh74oqohns8m4msu1p7nftqh3/jakagewotubusit.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811fe4bb567---denovina.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/41183503592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fusion+360+assembly+tutorial+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD6 11452 bytes
SHA-256: 871db6a37a7b93ac6621a2a60e24a14f5c82247e1ba4c79a87407e44cdc83b93
font_01_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 20604 bytes
SHA-256: ae50a9f7841b69f29b4ccd44eb2f772c4a4818e65c6d36031356d6360886d275

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