Malicious PDF — malware analysis report

Static analysis result for SHA-256 61a30896358ac8ef…

MALICIOUS

PDF

91.5 KB Created: 2021-07-08 06:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 67d7b7fb6dae3ec9065124a575c8358e SHA-1: 0b134d550284994568308e3b9903c769c8e6d378 SHA-256: 61a30896358ac8ef6f26ae8dd10c5492dfcafb95a150d2d5886f2ae06ff61455
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/bf759614fe1e735acdd441d5833470e9/befenowakutib.pdf In PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4802e118e31bf021f6d93609c1b37dfe/32997037474.pdfIn PDF document text
    • https://cargotavio.ru/files/file/87117968734.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/82277876357.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/77893547257.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3d7c60384---6363955349.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0393065001620184294.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/zotefewekaruzukib.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/0d92d112ffafee856894c31a4967bc7d/67227680768.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160854943e5424---nojukogepajobolekilubefo.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/97338060032.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/5faatgs7c9gqpht9q49k1f91tk/17322999839.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/gedot.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jedominalifarijonuro.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3a0f1a9de1345efdf437d0f9cabfdfd4/65204466311.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/waruxubaxunapu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee2be4617e---42686292227.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a802d72ad7d---nuboviba.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/jigaj.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794929b870e---wowasifivifibagogefi.pdfIn PDF document text
    • https://littlelightnepal.org/userfiles/file/44247716210.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/23642700713.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/91476645892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=6+principles+of+the+constitution+worksheetPDF 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_off000103f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 10764 bytes
SHA-256: 355b298d198f67e8a785566859d411228cf3efb82caafefb47f6009490eae327
font_02_sfnt_off000134c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C8 16364 bytes
SHA-256: 069b9412310f81536920d52dc60d3f57266374b8a06dcaec261719e6d050680b