Malicious PDF — malware analysis report

Static analysis result for SHA-256 20598628d98ad35c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-16 10:41:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 10cca795125e2a2f433de123aeac1153 SHA-1: 26e6f619c1b52318120c666134d8bd4a039fa8b9 SHA-256: 20598628d98ad35c13dbf4c1c981cbfca2d326530ca632a58db5e02dcba1db0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO poisoning campaign. The embedded URLs are the primary indicators of compromise, likely leading to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://smidgel.ru/uplcv?utm_term=exerc%C3%ADcios+%C3%A2ngulos+complementares+e+suplementares+7+ano+doc PDF link annotation
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be859ecdabd---panarak.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/52754140093.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/82181012944.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vurewovenupotulu.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/weluxiku.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f22c9994fd---57353029205.pdfIn PDF document text
    • https://atl-50.com/files/file/33412436336.pdfIn PDF document text
    • http://cuatudongnhatrang.com/uploads/files/62426035887.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/lanosefinofofirulazabo.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/wiwezut.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f65a0a24c6d09d3d4747b5be9981b948/duvopafamabexa.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/pitegejumuweliw.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f3gtukeclqjq8q9n5vs9mnijb9/gakewubuxudoporujapexu.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/31123047620.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/pewikejurerewizuxag.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lgf0mqmpqofet2mme056ktkdl2/4002268305.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/36702881009.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/nenodezoguzoridile.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/dupoxipe.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e54e6d974d8---64690318582.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/jetenunoviwudenadijevona.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d21228be---31226837131.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ec71bf4529b955283ec0c63d3d402595/zirofevewuxoxapozisalebez.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6d3847fe---64064835481.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 20152 bytes
SHA-256: ae578b6606cd4dbefc33ba8f65b461bfcc4d33f3d8a7694b926285b6f83d4ba3
font_01_sfnt_off000112fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FE 11344 bytes
SHA-256: a57c229da93e967bbab95900cd8ebc8709704be848a8a968b5bb07fad2383ce6
font_02_sfnt_off00012d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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