Malicious PDF — malware analysis report

Static analysis result for SHA-256 317bb436cfc59cea…

MALICIOUS

PDF

93.9 KB Created: 2021-07-29 21:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 550c93900a30cd62fe9ea9e29c8786d0 SHA-1: 98a67cf676b2f00a4f664d1b5f22d95c4e4ca028 SHA-256: 317bb436cfc59cea00e8f61f19b11c304b6f7c80200116fb23290ec0554e79fb
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=descargar+todas+las+canciones+de+los+tigres+del+norte PDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ba841a6e---15693541207.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/64223180456.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f241732c7---93067374332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddd440a3---rifofezolowabirinuxaf.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749aef0c9f1---48941636686.pdfIn PDF document text
    • http://www.celso.org/download/favorumunelobufitumijuz.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/54377991748.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e89c957c2e4dc0ea7ea2ffdf64e5ea9e/1955078556.pdfIn PDF document text
    • https://makenie.com/upload/files/vuwuzulipezaxogisagozubej.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/50319675611.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/xasudobowejolas.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/73209814886.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/40651478197.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/68054030237.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/38b0ebe3763fa23c01eb017f86c79a36/93138888173.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b77409c5563---ninaritagemazuratipaxovi.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gumikugazagedegiwixilixu.pdfIn PDF document text
    • http://gloria-eurex.com/48566999294.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b034b41ff2---nosakixibegexugaxiduge.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b320c2455d3---89592116588.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kagekin.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/98556436043.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C2 18668 bytes
SHA-256: 8b25adb044e84a8fa8f96a834800161e3a8424318299afe2f93576c535d8f40a
font_02_sfnt_off0001387a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387A 10544 bytes
SHA-256: 029e02002d9fc3255505e2b719cb9fb3504400704ecac486d600922e807e3af8
font_03_sfnt_off0001506b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506B 17004 bytes
SHA-256: 1d6a7c9b1d4d910ef2546efc64e1e13bdf32658182e4648c55faf23d02ed6acb

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