Malicious PDF — malware analysis report

Static analysis result for SHA-256 619f6deb31fd23a4…

MALICIOUS

PDF

110.2 KB Created: 2021-07-30 08:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1b72526200de4014dee2c4eaf875700a SHA-1: a5dcc1f579ac87670a4df13b2aa94447b8296a51 SHA-256: 619f6deb31fd23a40bdcf9e5ad9544bf882ab247dfe921c498925ddf14d06b54
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 CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/pm8klen697n6a3153m2gv30b97/89390142396.pdf In PDF document text
    • http://dokumsuzgec.com/userfiles/files/41480499572.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf84c61b50---91666026663.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c604d78c---gigajatavojesidiligabu.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/eb80c6df482db2822bf5d46a581f0e38/80119627853.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/rugerobuw.pdfIn PDF document text
    • http://greenbrier101.com/userimages/rezugejedekijasoxok.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1016a680633c5505308ee3458f3906c5/52397872000.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/mimususotonezasabiruma.pdfIn PDF document text
    • https://filetorme.com/upload/files/femoxi.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/46007257586.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/65027746390.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/gureregutotalotadedo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231431e6ff---jebewoduniwuzago.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/b05951bae71469d86e6ba3696b24876d/39001333227.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072661b4bd4c---29900971902.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/50bc21002286a7a645e9a88d05472280/puwutedoma.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/247kuakqh1afft2k1vmj5u3ke5/pekif.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e435f523fa7---97255617558.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/63587415440.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/8d28b232ba38b37b0d35893a1ae969b7/85965607128.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/23352382583.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/rifolejaxatixadino.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+2+chapter+1+practice+test+with+answers+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001352e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352E 1980 bytes
SHA-256: 36f52d9f1b0649cd4bb9ad1f0e9daf2514039cbf8caae89f4d065a5be5e21721
font_02_sfnt_off00013e22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E22 21588 bytes
SHA-256: 54436fa80c08a9f29cb6ab1c9171eda75bf4cdc04f89397db6e03ec600fa5511
font_03_sfnt_off0001778a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778A 11156 bytes
SHA-256: ddfa933fa62761dbe87736c63c929998c7612c2a548ef6161c0d55b3aef7c1fd
font_04_sfnt_off00019151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19151 16484 bytes
SHA-256: 1777eb85e7e5673cce5d14d60e6c43448f805bb40b39327ca14753f8d66cad66

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