Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bdaea0382fc6a5…

MALICIOUS

PDF

91.1 KB Created: 2021-07-18 00:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: df82e8e3e4ac37fbccc7949d1500e365 SHA-1: f6ca2c3c54d76333b0306e562131c72279a5982c SHA-256: 50bdaea0382fc6a50659bf48dfa71e256e806c681e9dc3a15864a04f67027db0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The file's structure and numerous URLs are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://biogenetixpharma.com/ci/userfiles/files/91789048838.pdf In PDF document text
    • http://pamat.ro/UserFiles/file/vuwotaferoze.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/rabafakurokoganepelug.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pf1d8qk5frat3skmjeat5d5aqr/31084695761.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/45887294168.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608dad8c5ba69---3521333681.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/44689092029.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/tajixadef.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c6f18680---tibosoxafoxewilewop.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/96051034526.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/meguvajinowore.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210718_050530.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/5fa5433b6321c50e9b0db196f9bd6aee/15742734542.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/balago.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/toxigevonejuriwifudu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/vekobarijigupisu.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f0da964e533---bujakewupoxut.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/f2d5f6f96c4d0151b15c3185254e885b/43980506039.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/81867418229.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871904eaf85---78455131579.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/rawegesu.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0bf69cde6bedb38d27ad81e7c1493f7a/51788214480.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/95710742175.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/59689520037.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/wipoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=food+processing+and+preservation+pdf+free+downloadPDF 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_off0001008b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001189d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189D 17272 bytes
SHA-256: e513eaf316a4d99b2c2ff8ee886ba56674d2d7fc2a897fcc9acff2b3ce5238d0
font_02_sfnt_off0001455b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455B 10924 bytes
SHA-256: 63b5ae16772a7fb43237105024359304f2c39338b8c189a31fc43e218f32f94d

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