Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e2bc099e58dab6…

MALICIOUS

PDF

103.0 KB Created: 2021-06-10 16:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bfbf68046f780ad241f2a5e499ff0803 SHA-1: 380c830b8df536b02873df8fe8a364d59db30439 SHA-256: 91e2bc099e58dab6449179f45d79e32ce977d30419cacdaf23f379eff7ef0edf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or scam attempt. It contains numerous links to external websites, many of which appear to be compromised WordPress installations used for hosting PDF files. The document body, though heavily obfuscated, suggests a lure related to downloading software, specifically mentioning 'tourist bus simulator mod apk'. No scripts were extracted from this sample, but the presence of multiple external links and the nature of the heuristics strongly suggest a phishing or malicious download distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7402

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=tourist+bus+simulator+mod+apk PDF link annotation
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/3cc881990e66ca7cd4c72bd80fea3056/zotakuju.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba089d81cb7---bamumosekomanedet.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/77568743258.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a4483ab90---3186721555.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23ea272cb3---38635164816.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/13764060981.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/11087128209.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087af4bca38d---29346944273.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/nujavunumopivovasus.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/8918k0bd05be5okhosdgpm7oj7/farofifo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1983b386f---zisavutirusoxixi.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86dd943a01---sibilasexajenubojoxaler.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d824371269---61178737654.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac687747c95---30511719230.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/refejizabom.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c0452433---28082146979.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 5256 bytes
SHA-256: 122d7db1a59695b3bc04ba7391e139d0333471d010d5fb983e8688285d96b0e3
font_01_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 8168 bytes
SHA-256: 251230c557590cc6494b25bd607f9c42d970a4ae4ab6a6ca42d0c0c0a4e01c89
font_02_sfnt_off000134a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A7 3216 bytes
SHA-256: e5b5835a6577f743501baa2b78caa297d456e08f01aa914fa0f3d962fd783d91
font_03_sfnt_off00014140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14140 2812 bytes
SHA-256: 758aece90c25b4e21db7cce8cf7466f5abe089d1b5bfc39c16d79463b5ed2b97
font_04_sfnt_off00014d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D13 21556 bytes
SHA-256: bf70243b71fea809ef09167bcc723f4175b5b4b88c469ccf569fdda40bdfec55
font_05_sfnt_off0001805e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805E 16232 bytes
SHA-256: 05c5eedb89e3e73e3c7eab1087ef8d20003cc4dbef32e91d64b3ee9f266609c9

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