Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce60e8ec63dd679…

MALICIOUS

PDF

87.8 KB Created: 2021-09-05 23:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3e102c9d5aba29b21ec74a0a05cd6290 SHA-1: deb578bd8c9e1175e74dc5cb7bf88680e699d313 SHA-256: bce60e8ec63dd679dcbbe9f57dc3dda97008021cee9fa8e7c65c39d952a6cfbb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards a spearphishing attachment, likely leading to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://cructi.ru/uplcv?utm_term=prepositions+of+place+in+on+at+exercises+pdf+with+answers PDF link annotation
    • http://wksystems.net/HotelEstimator/userfiles/file/lunogatitegevorape.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1e0cbf353dfb62439bc15f3019ea34e/zanuwewinukanevikisu.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/ruroxobufoxefiterifaduz.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4df6e0c5d---figisuk.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/pdfd2sl9qq5pvl7ft1q3bjr6ua/xosodipebonumezadolet.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/45324633187.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/lofunimezaxonobulo.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f9380734d---nilitev.pdfIn PDF document text
    • http://xn--b1adcbbai1bezln.xn--p1ai/content/File/13371643360.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/31dbe46f731ce9a3675811e9dbb8c63e/67808714758.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/7491860154.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210623135102_88y6zz.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210811_A4E2BAD33FA32389.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/hmvvtr8kij6km7l8ufp74teieu/vunatuxovikajalexejimokez.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ik81qgm4mnh1cpmp6b6iv8sq28/48869755633.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/84558514445.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29002c499---87720562363.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bd366df7b---42201561346.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609109ab9cf7e---48117259614.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2bccb49f---fasakomobowozumotezeku.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/zomibifubosezakitizevo.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/e4e56244c3c08b3e0c88614afc76787d/towadesabilajitinifuge.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC936 10904 bytes
SHA-256: 4f516b3f0b820089ca788e3276b190b834644116f78b7376eb56ee06cbb84dce
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_02_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 16156 bytes
SHA-256: 6e4add03fed73229ac5180939a5b17dfa472d7f4f1ac7850bac5424ade425961
font_03_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 21912 bytes
SHA-256: 96c30bd1066383d35287df05d140afef2f9e4bc7689e023c3564bc1d984fddd0
font_04_sfnt_off00013828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13828 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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