Malicious PDF — malware analysis report

Static analysis result for SHA-256 0950ae3eca12e0b2…

MALICIOUS

PDF

79.4 KB Created: 2021-09-06 23:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f655e8729d58b23747e3cab4a3f1380b SHA-1: fe6d76baec58523cf79f4f0e524cb8c5506fea38 SHA-256: 0950ae3eca12e0b2411a715d3499bc24410f3a1a9e0f06562aa19faa6356f10a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, redirecting to various domains. This behavior, combined with ClamAV detection and ML classification, strongly suggests a phishing or malware distribution attempt. The presence of external URI heuristics and link farm indicators points to an effort to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://laborke.ru/uplcv?utm_term=biologia+molecular+e+ingenieria+genetica+pdf PDF link annotation
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160853b6b3fb9c---34023376140.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04ea18e69b---sigaxalesirifedogaxikuwux.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/807f62ea98e14c51abb46bd8f9ac5491/fajelikagerad.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lasawigutabalim.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5124568e08a148d59afac66c6235f3c2/99921977650.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/2fa2e5c43addd694ff4417525648e3e6/77307066671.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/27782622281.pdfIn PDF document text
    • https://bigpointpin.com/calisma2/files/uploads/sugesositimu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/afgine8k37idu4dg1djg9coutf/nemit.pdfIn PDF document text
    • https://preciseenergygroup.com/media/47074821222.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/kebaxuzixevilelitu.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/zinebusisa.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/fuzuvolafofugi.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/3295962606.pdfIn PDF document text
    • http://plainsailing.de/i/userfiles/files/pumaxokulakenidijezatef.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/27453887268.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/daleluwi.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/16080546743.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c4c281716---dexesoselikibuvaruwejowu.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7414566120.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/bekutefoxepubosupek.pdfIn PDF document text
    • http://lbassicurazioni.it/file/21761466619.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/a5b2v63v8lqvhbsjpf0rt6tg3o/julamun.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210704135111.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/28516406834.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/54913446386.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/21933046019.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF78 10948 bytes
SHA-256: 476c4a2bf47795ec282cf4cefd718f908305b51d2e1713ba5fcb1ec341851192
font_01_sfnt_off0000e8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B2 18176 bytes
SHA-256: 4236032d6f2c042465d9304215de36e3f73dbc0d31adfa6e73436698499abe7f

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