Malicious PDF — malware analysis report

Static analysis result for SHA-256 244265b8bb2dc229…

MALICIOUS

PDF

99.1 KB Created: 2021-07-06 04:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: b9c50432f2ce8c1e78d189d2fcb58598 SHA-1: 819da6c251d35577984a9b10682cfd6607cfc9d1 SHA-256: 244265b8bb2dc229adaec8b3434f5c821bb15c4596c3dfe3fd621d9457c8a0b3
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 0.9929

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 https://coretry.ru/uplcv?utm_term=time+and+work+questions+for+rrb+ntpc+pdf PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/tagofukanezij.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc192252431---87540486751.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/kreq9u19aac7tin0mg2hth5h85/nusakupamezadinekadigewav.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7814c5f71---bugudegifuxumurafut.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/afa5b9ef60801a957d59665dca03b39b/47414152187.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/272819de523b86991771fb3824b07964/sosawu.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/80469790979.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/85348949620.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffbe8fc04---dibowonazes.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2596d2a09a2c38b2c0d1d6345afd3334/daxonokuwixew.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/venonoxefulogu.pdfIn PDF document text
    • http://hoctienganh123.net/upload/files/38522626201.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430103022746764.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/68913180161.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e39973c72f0---98888001545.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fikomekusisa.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/19/file/15711701279.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce4f9f5f8---79543406298.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/1ee9f96cff4a3dfba1393dd234122b1f/57503567915.pdfIn PDF document text
    • http://ibb-online.ru/f/file/45595329485.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160781cbfb5d1b---45054599392.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_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 18888 bytes
SHA-256: 7e83a4bd53ab25c5761363e02f44f39492080243be470789657f9a69d7e46f79
font_02_sfnt_off00014c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16487 11260 bytes
SHA-256: 439893e61e54ef3a4b7b330319f1f02e5a567b90f8773a9a33735ee9ee21a780

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