Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2d21d1b37152b2…

MALICIOUS

PDF

91.3 KB Created: 2021-09-06 19:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f454b956274ff695d8a01ff79ceddb0 SHA-1: 116e2e71fc59cebcb3bd9bbdabef850f0e040a68 SHA-256: 4a2d21d1b37152b2f76969d0b4dc7edcc81c2cc82a04b6c8b94cdc5918371844
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. It contains numerous links, many pointing to compromised WordPress sites, suggesting an attempt to distribute phishing content or redirect users to malicious sites. The presence of MFA lure heuristics indicates a focus on stealing session tokens or abusing multi-factor authentication mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3356339418074f6c71386873e1e1fb42/26821651338.pdf In PDF document text
    • http://x04ydivan.ru/userfiles/file/sopojulupebevisabom.pdfIn PDF document text
    • https://yellowstonewildlife.com/95904164086.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/11389693145.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc2c45d3f3---99896420738.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/98467931041.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/febojez.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16337f24b---88209427359.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773943dad99---tafaxegapasoj.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/t4tr6o8j1cueuh6tipd1hqpn7k/47291262511.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/423163968612c8a9e75564.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/t0k5h8rc55uj97le5uh7folji5/wutapakatolovekekipivozib.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/wuzemozarejede.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/jijonezaju.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nuzopu.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/78393249034.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/sogelasaximopemumalokilej.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/zuwotirofapovar.pdfIn PDF document text
    • http://immopolignano.lu/images/zukerovefuragapijel.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091801f09b72---93302947942.pdfIn PDF document text
    • http://proart.by/media/file/moperekadef.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f1f96e8022c04bc1a93cefcefaebbe86/83061196175.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/4b96605e84a7d49abd3ce3228e324d85/41438024073.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87e3acc0f---bagopemizodamumalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=legatio+ad+gaium+pdfPDF 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_off0001053e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 10480 bytes
SHA-256: 973988e4b35971fb0877b330c059acf7fd7e127c53970b25e9d5daa94006ee35
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F4 16556 bytes
SHA-256: 5934a73bd7806001594dddce48e514a180602eabbd5a8fffeca58c5af97121a0

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