Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc1aa9d9db8aef6…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 07:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bcfcefead9e8a8c1ab9fb2343d335ea SHA-1: 6f67b460b6bb35b1d5a881ce08f79049a2346d83 SHA-256: fdc1aa9d9db8aef6af722d5eb201f273f54f7e884a70c9872b0ca6f83db95ce6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the presence of external URIs, supports the classification as a malicious document likely used for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=treatment+of+schistosomiasis+pdf PDF link annotation
    • http://moto-bike.pl/userfiles/file/rakeko.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/kefisapi.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/e0af1f131e83ee32ac69e54720c9cdcc/wewivozaborane.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/notavilewixuf.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/29893491671.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/98359075869.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cbab628aa---73653431593.pdfIn PDF document text
    • http://mutitar.com/user_img/files/11586648428.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728a013f34a---42514154669.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/jozokupuwewura.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/nalamotokev.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b63534040a---patadupexozisidoxubisiz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc42123c1---tetojolutuxujenozanot.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/27546090165.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7604965e---pefurimowubaziluxudaje.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/mezikekefakuvuzulored.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/i9qdk5u1lcb15pqgafb4t7dp03/gajesusevekopudakobe.pdfIn PDF document text
    • http://broeinest.org/ckfinder/userfiles/files/13321103977.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/bazuwagefomo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/4d43e03c14cb6ded10f1baf6521e8617/52818329544.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/51814784360.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/70c7429f1c58a109a72fbe0180a655d5/85237122850.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/bogarawupemir.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/93d142075a09c7cfb42a14a8be984f83/1398313316.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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED78 18176 bytes
SHA-256: 9e4c9b414df8dee1d29e9b370334958114e9e76950ae2755713517bc44246051
font_02_sfnt_off00011d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2F 10800 bytes
SHA-256: 0687ecbbf64c92a8bd55bdb2f74de4e00ebe6a111c29522335010b416450466a

Open this report in the interactive analyzer, or submit your own file for analysis.