Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7bd0fd4459efc8…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 15:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7861388539966141ac53c03bf24b1577 SHA-1: 5c350dd31fee1c37a602e992a8dad7b5614334ee SHA-256: 6e7bd0fd4459efc8ed56671e91a468871cf214cc84432a90230a79350b217f21
164 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 embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=smart+view+samsung+j6+plus+apk PDF link annotation
    • http://www.saletime.gr/admin/fckfiles/file/raxulegajavuju.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/vibepawara.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/28695164311.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb87aaa493---zugizigajixoxuvutivo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/89096938703.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/siretuxiwomiviloza.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/68157631697.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/62583152214.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/90073453703.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/45484101562.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471c9242138---67651666739.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/zanaxuno.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/xuzemefediganumesat.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/fojebuxirabotez.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/75010757590.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10574622426.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/felofufesatilo.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/sozezusetodilavazuxexuz.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/cf63a872391de29ad7b6c1ce0df504bb/zabakepawisivape.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/63361806853.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/nizamewotodajulukomowige.pdfIn PDF document text
    • http://househouse.it/userfiles/files/36453866795.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/19256034626142001ac32a2.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/novugexabemutare.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/23328006062.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/83535103986.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_off0000e4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 19512 bytes
SHA-256: 26513f852060456f407d2c56ec6a08fc18e7dc131cfc9595f4062fbaa491e997
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 11192 bytes
SHA-256: 2d380c1e0ea67ea84ada06a0bd4db300b462ee541dc5962124383961cc4ebb0a

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