Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb5e94e3f118b17…

MALICIOUS

PDF

74.4 KB Created: 2021-09-18 00:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3cdf57730255d2ecb769dca583b0e0e1 SHA-1: 88974e293e3a83f8e7901093acca5b5e128442d2 SHA-256: fbb5e94e3f118b173c65882e11665acc485c8ef207f6b0816923c3cf81776ebc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/75143226031.pdf In PDF document text
    • https://condicionamentofisico.com/arquivos/file/zitunazakixuzib.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/sikifobotita.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/9038101460.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/monutitutad.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/46915252352.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/mirasunimulisizasu.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/vilujuwuvafosukile.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/44367198046.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/10225791756.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/15791611228.pdfIn PDF document text
    • http://remobudostol.pl/pliki/manoxizefupipar.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c15ad8d1701fd6467ae9c10f89812495/povodi.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/28422799932.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/25617711647.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/97626876167.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/87945098415.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/d457b3cb41cab54e525d935277fcbae1/dalajegiwuwabuboxutoxa.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/rezagamigemazufetobuw.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/fosovoxituzexotexen.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/gudoverakireruligukubagi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f98340e34b---52082855368.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/velid.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/85226580928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+minecraft+mod+minecraft+apkPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309473395088.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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 10792 bytes
SHA-256: 4b1beedc708ffc3882ed7586e2b0bf44a7a7b3ec660c9cd8046854ab53608125
font_01_sfnt_off0000da94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA94 16092 bytes
SHA-256: e16e048f246660ee19caa70e077cba7cccd0a5059032713dd02fa5b044b79451
font_02_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1