Malicious PDF — malware analysis report

Static analysis result for SHA-256 366e6941923c93a4…

MALICIOUS

PDF

107.9 KB Created: 2021-08-02 08:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d0c1f1de78821512c9c87cb2d7c2c03a SHA-1: 5b3b3c9b127824cd8f6b97eff10224b28c878d92 SHA-256: 366e6941923c93a495420386d41ce9e1a67239796e86009b1dc752c8d65c15d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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 http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ahjk5e433108l1a3epu3qa03s7/resaketeki.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/49870418028.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079038955cff---fitirunuzetegerenogefumov.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074607cbe2b3---bulaji.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08beb42dfa---xafukon.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/57019709028.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/70553120535.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d12308e0f7---sazogusokoxe.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/gukutevufezadozira.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a089dd93905---43733468436.pdfIn PDF document text
    • http://poorclarescork.ie/images/lopuzedujapizamowo.pdfIn PDF document text
    • https://alutat.com/data/file/93311749915.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b269007f2b3---88715720297.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/14873503641.pdfIn PDF document text
    • https://energooptima.hu/upload/File/gaserekemu.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d75b83df60---87057991757.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/miwilamal.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/tinugiwepu.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/36097759454.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/30241331660.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d30b8af1c0e---suzazodina.pdfIn PDF document text
    • http://texmet.pl/userimages/file/43756738429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+a+demigirl%2FboyPDF 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_off0001278b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278B 18840 bytes
SHA-256: eed15b3dd53bc3b4b281c74885b4d398aa5a2b2436f305f32bef122b14212537
font_01_sfnt_off0001599b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599B 10872 bytes
SHA-256: bf4a98ff769c9a098b4ff2ab3d029b6b2ffa17cdab46344a6f415db95606afb6
font_02_sfnt_off00017290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17290 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00018806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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