Malicious PDF — malware analysis report

Static analysis result for SHA-256 d63a599442bde451…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 09:31:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a2728547aae9e326c57e04944c7b9c6 SHA-1: 85248a127c44297e8ad51c227310aadeb741b8c1 SHA-256: d63a599442bde4510cdb01668ad9e78e412d637fec840145ca40013d6f9ddb7b
156 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://limoride.net/gallery/file/62694959810.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/e5segm1eg1lrieccu74aj3qp04/kodonipuxa.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/juguzunedasunavediwakeza.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/og5l1i8g3a0slq33j14lke57bm/vuxixixonoliliwotoxap.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3a052dce---kexorusazegumutunuzo.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/88054099896.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/mufugarolovogidifegol.pdfIn PDF document text
    • http://fluorescent-training.com/file/jewitepivujigudokifes.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/21185362169.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/11585949864.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b17b7a76---xajidaseguneziwujasan.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/vavobuxorivojerekadoluzis.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608676a80d7a5---bogajejanaxomejig.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jofepudenojoxufol.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16097ccc791909---lusifuxunosi.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021619104613890.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16078c3958722a---tobepipa.pdfIn PDF document text
    • https://palet-school.com/files/files/ligak.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/2798267800.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/rhd9i2tk0umpq8u9t6j2mdvaj1/10711655352.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/44406026041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=weber+genesis+ii+s-435+manualPDF 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_off0000d7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AE 10884 bytes
SHA-256: ee5242b6fb5ccfc700db8db8df209391f6d5f0441e7fbf4cc2ddb64d583fb238
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 17968 bytes
SHA-256: 4d79ed6a6267d5bb33cea8966c9004477b32d028edf579024bd744f48a3aedd2
font_02_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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