Malicious PDF — malware analysis report

Static analysis result for SHA-256 11af9f0f87addf2e…

MALICIOUS

PDF

141.7 KB Created: 2021-07-17 10:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 26d86785dc648303c393f74abcece8cc SHA-1: 49affb07a10e236d42851cd76c3814df0c049dd3 SHA-256: 11af9f0f87addf2ec2b7b456d4cd4fd49ba45247893a714ae0ab8ffce7227906
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and numerous unknown URLs confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b5662dc3---luwolenilo.pdf In PDF document text
    • http://mousike.it/img_ins/files/jokozemukimeb.pdfIn PDF document text
    • https://maclashoes.it/file/5299381227.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gixurusisubomuguzasenexu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50a93a635---48089374749.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/xidosolofutovogojidegur.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jr0fo123esp5bkfgt3i1u7k2mm/merosafiwit.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daba4a63055---61413014303.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/digobujumerotezita.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b92c157ad6b2d49ad4aa3c7dc3798797/fovajujuz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/09af89eb95ce4afbaedde90f1e353498/68726718325.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba094a97c0f---gojikuwinimefuxe.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/cac48285185cc25977ae1842cc6bb7d5/lafexamowa.pdfIn PDF document text
    • https://autopratichesas.it/file/17518903378.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/xatigaruxitirol.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/sobaxododapivuliviwuroda.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/jaromifok.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ebe76a01cdb42c31d094b501d001d08c/12034913292.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vul3f89qgiv83d8qqg1n37769q/41315579699.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4a62267d9e85245adc91dd074dc5d4aa/36897118480.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a903c33bc63---xubav.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dd7b4aa88---juliz.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16071932409c87---pobikusejofezulefoful.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=nudge+meaning+in+malayalamPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bdc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BDC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001d5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D5DB 10296 bytes
SHA-256: d8d70e0ff99d5376f8a654a7425713c6970963bda3f96cfd517aba4cee1b8f63
font_02_sfnt_off0001ecaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ECAF 2940 bytes
SHA-256: e04995c6afbb1f72b3a44532d87277fdaa1263ae14e29fcd749e213f7d15bd50
font_03_sfnt_off0001f8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8C0 18984 bytes
SHA-256: dd5fa7044d18b6a3115f05bfba8cd94e02761f941770bd1ccaf57a1e0c5fa1b7

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