Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d7c0040033c5d2…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 08:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 945c2a4c60d2bda9a90636f74235ed9c SHA-1: d3182d4e191086fd2e7328a2f9974507efa9d50b SHA-256: d6d7c0040033c5d29471841f51ac1f42e7c25c1ad01057f1c220920a81701d2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=my+city+ski+resort+apk+download PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ccba756f2---19053591986.pdfIn PDF document text
    • https://sharenkon.com/files/muwovevagerixepifobalazik.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/54463993366.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a4d2a4eb18cf99834d6e7b425d45526d/34783516716.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/kejipewuw.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa327d6b3---13053668164.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/43316560025.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/16632235990.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/tixidutivudipovutoziwatil.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/kenuzowixezalusubuniduguv.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/wilesex.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/nujukibafa.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/vasebozunakumaxaluzapu.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/49295113750.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/28730102639.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/0366c207d587d908946ec6f1d1403682/90814235193.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/kiwipejisekusebi.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/12280042156.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/metegowote.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/nukapan.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/87825704178.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/56219486806.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134873da3640---78650430450.pdfIn PDF document text
    • 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_off0000aff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF5 15480 bytes
SHA-256: ae842050bfd11f586583922a9199cf3b9027865e20ddf927fd944f8da3b3f890
font_01_sfnt_off0000d71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10792 bytes
SHA-256: 365a38f27badb025033be9c7fdfdf75291b6476249d9884115cd8860ebfb0577

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