Malicious PDF — malware analysis report

Static analysis result for SHA-256 68502462038d2033…

MALICIOUS

PDF

90.2 KB Created: 2021-06-26 05:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fd1b81e069fef22f275d10daea3ea77 SHA-1: 96e9671c0150793bd28cf5f637f49a05257b0f1a SHA-256: 68502462038d20332247e75f071ff8f12f39f0afafe975376a2d98f5677dc01d
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute malicious content or phish users. The PDF itself does not contain readable content, but its structure and embedded links strongly indicate a malicious intent to redirect users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ubest.ru/images/file/mometuw.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/d4g4hp4teb4pdrenjb5hlc4g7v/58530220239.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/m54606l7h1mmdnt61dplk5kpt1/putixaredibelatovolaz.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/30999885332.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/26226279003.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/58264303048.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfd54c8737---vonolojubupitokinimosu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/790857b1800a701b462fd6fdadbd417a/nuxalajejedefusupu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b7ce19aa---43279840052.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc28007b6---63932411932.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/dujaxoxipujumabiz.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/41351109989.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a00c2d64a3---67550382346.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/2689248557.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d5ce34fd---lilodoza.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/boxajivigumutokeguze.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23720090199.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/72772890726.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f23b28fc25c3c013798db9e29cb8186a/75193861342.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1e5ce1c10---85985698213.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/s1ecb577ivuf8bf3c3avkoijtp/93654842747.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/99789719373.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f8937a874---21587840741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+letters+does+the+german+alphabet+havePDF 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_off0000fa22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA22 18444 bytes
SHA-256: 849d2866275e5e073cea1a60f3ad4cae8f17a0caa9f6297c1293955e3ee2f0bb
font_01_sfnt_off00012829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12829 11144 bytes
SHA-256: dc784c52512fd5d519b155ccaa3c47944db43529fcbb70c57869f41cf443f7c7
font_02_sfnt_off00014199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14199 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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