Malicious PDF — malware analysis report

Static analysis result for SHA-256 76372e18d103eda5…

MALICIOUS

PDF

97.0 KB Created: 2021-09-06 15:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7f5b0b39393796f6eea0673c4d3179b8 SHA-1: 140a976e654b284ce7a759cc741a84c94bf69460 SHA-256: 76372e18d103eda50fb43eb3e7fb44ff29d8b256fae1897dfd558b9261e9668d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://netshopnepal.com/userfiles/file/69351742914.pdf In PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97395728438.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/penitenanixexogivaluma.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/19782695723.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/44678650827.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/61691056923.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/jawinusiziwineruwelekibeg.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ebuti2e1m7kaifha01oto5s913/rolipimumetoxozomajij.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/36171792203.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4ef66d6e30b0178b9eb08a25cc40f6fb/bujuduki.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210808121012_33gfgz.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/3221585e4cc5dbad00b7435891eabd86/jewikalipanejixudas.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/goper.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/12664008199.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609861f97aeea---60048928812.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/55939396145.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mugukokino.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a204ec41d---jazuwoziginoviluxatob.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c899c00652---taxegokufivufaf.pdfIn PDF document text
    • http://strahyi.ru/images/file/pitalolagefakaz.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/57314922543.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161007e38c8cf6---pikemow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=filosofando+4+edi%C3%A7%C3%A3o+pdfPDF 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_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001223e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223E 22784 bytes
SHA-256: 2f751d35238d5d6d5179eb1a18c4f5746577e26deef2b4fbe7eba85ac9519515
font_02_sfnt_off00015c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C11 10812 bytes
SHA-256: 25785052f72a284571fa200544f1363ffb5676c00ee710696bb2d5e81dfd8a1e

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