Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b56bf3703f5fb1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-03 17:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9705301ebdbc1c3a567988dba7d9d0b2 SHA-1: ea462be4a70dff9660a2cd1363f1d4d10e44fc91 SHA-256: 35b56bf3703f5fb170495b2b9793292fec7665015c62af91fbf3035e5c0a8e79
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many of which are hosted on compromised WordPress upload directories or appear to be part of a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://protectakoteasia.com/ckfinder/userfiles/files/86104228980.pdf In PDF document text
    • http://doo-san.com/userfiles/file/20210521104507.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/neguzatepozezaruvevanolu.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/bolegixumevugotitiwegodoj.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/kefilolamexemeduzinuwen.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/53978247459.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/71764557414.pdfIn PDF document text
    • http://entrackintl.com/uploads/girederanuwig.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/73585087081.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/97231436408.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/depatokonavavinajegodu.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/4dlio90rpck3am37oja277u5sa/zapezitasezerexibalenoju.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160903b608f681---22916401746.pdfIn PDF document text
    • http://paliukenas.lt/i/File/xusewukaxitawunofen.pdfIn PDF document text
    • http://salwex.hu/file/29281677160.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/muwosukeravilizomu.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/364504778.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/192e51bccc5affaaa7bc1d895995a4f0/76404783425.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/bamex.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/zefoboson.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/fisemodorofugepam.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/13295194832.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/fovobuzuwurulusazu.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161077513c2634---kefabemu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5911b7b5cf0313105aab13c19a1aee36/69783815946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=voxoa+btunes+manualPDF 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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 20140 bytes
SHA-256: 647885327ee8de1282828a20bd820a8d260aa2bfb1a38c0a24ac45fd57d73cc1
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10388 bytes
SHA-256: bc4b58b56291438e4e1494ddc3865bc0925593d398fe6294dd499c3dd388c5d9
font_02_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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