Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9cae56d60b3a71…

MALICIOUS

PDF

96.6 KB Created: 2021-07-02 07:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4874b00d0511878dd827874843a51db4 SHA-1: 91a38ce9841b005d234df7aa6c0a14848b0a98a3 SHA-256: 6a9cae56d60b3a717d931da3b0fc030daacfcc041373a2c0ccdecdb1dbd05f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure align with techniques used to distribute malicious payloads or lure users into phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://hnysft.com/d/files/5543761301.pdf In PDF document text
    • https://aslimitada.com/userfiles/file/19713427078.pdfIn PDF document text
    • https://digireg.nz/upload/texazerob.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8264lfq1tjoennr95na4ckd6uq/lawiwibanibomoxikon.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba7414556---51599628741.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wonakireruvakaziki.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/9q4uckevqdr1vokvf4af3jodu6/13046755497.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160865478aec22---madelidipilopupej.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/wudonibefosizalolezawata.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/tixemifikopedijuponunusof.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/4e905c374d035560e67eb87607c6aede/75615302780.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084557acfbb8---84994169142.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/79262566933.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9c768e60fe51732a044b9f7bf197397/5175270505.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da49f6d8fc9---jaxodafogodozilagaxo.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b563c4c7e---gatexuxemituzoriti.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16095e6b10b88f---zexevebivefixikidiko.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/527d9591cec486c35b7782ddf089d2e9/furopopopulozotezotekoluz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160de3a712938c---47098826021.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-4-30/20210430001940578442.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/pak4s2oegh2s20ig3f6c1krlh3/fibelogasukuvenoguromo.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/90koqu291h8me3hofu143h1qsh/73530607138.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/poxuvezemixodakodudi.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/jeviwukodapupofupafise.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=connect+pdf+into+onePDF 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_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 17876 bytes
SHA-256: 1a9982035a2c6a4444065964e3bf3bea6b212a5e34f80632a8670a8e2951cb8a
font_01_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 10168 bytes
SHA-256: d7d90802786085f3eaa1e9914d0c60bab54ec3c28936410358d696f505392c28
font_02_sfnt_off00015d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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