Malicious PDF — malware analysis report

Static analysis result for SHA-256 510c83b13a8edd7d…

MALICIOUS

PDF

73.5 KB Created: 2021-10-05 01:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 659226084870015f77ac145315ae8bb9 SHA-1: 13b241fd857df91dd0bed3f0a956dcce061a742f SHA-256: 510c83b13a8edd7d69a0e97cbac9620d5d3572f438123dd1145cde73bac4f81f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://stensoproject.com/userfiles/files/26084559215.pdf In PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/70271336207.pdfIn PDF document text
    • https://ambalatender.com/upload/files/7893466859.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/95545402808.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/wuvas.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136596cb9899---mozed.pdfIn PDF document text
    • http://forti.in/userfiles/file/55975088769.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/mojotil.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109101531155599.pdfIn PDF document text
    • http://gospodarstwotoporow.pl/uploaded/file/15336038384.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7d4d95d4a---loboxafokugoxagomenelekew.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/6eb4b7c8aa158b799ec0bfda2b571a37/76263533203.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e24b84631399ad32696f6dbc0a31b745/paloxalifatevavawi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed57571cf0---89735410184.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/33654297596.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/memivuwa.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/80916131463.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/wewivob.pdfIn PDF document text
    • http://tatvan.in/userfiles/file/xisulujelubivo.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/tusexalurasudipaf.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/21692206995.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/simaserojevexofedodoj.pdfIn PDF document text
    • https://marlin-shop.ru/ckfinder/userfiles/files/tazif.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/joruluguxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=get+robux+for+free+without+human+verificationPDF 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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 10920 bytes
SHA-256: 023a02318f806511fdf4ee87d40ca61a09f5e0018328656c2f9cfe628ec950ba
font_01_sfnt_off0000d616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD616 16392 bytes
SHA-256: f3d4b482ebb6d424784d38fab25ad8ff351bd9adc58f99e88a356248d5cdffc1
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1