Malicious PDF — malware analysis report

Static analysis result for SHA-256 7998dfb3ff5eab23…

MALICIOUS

PDF

94.3 KB Created: 2021-08-01 00:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 46712225d0e90af7dc862e2377bfb10e SHA-1: 37898d280a2da862e7f85a719c5a5ec4c9f09d9b SHA-256: 7998dfb3ff5eab238a98ca8eb521a0e6466f1eba3170261c0c001004cf1cccef
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The `wkhtmltopdf` authoring application and the nature of the URLs suggest a potential SEO poisoning or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=can+percussion+massage+help+with+cellulite PDF link annotation
    • https://alihuata.com/userfiles/file/vomoj.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/43156879748.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c78bc9b4c4---woxuwutemidavina.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/jujafusuwanubet.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/ilame0ifvgmlsdr4mh3ctacr84/2149240719.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wofedarur.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/vhs8dm89280u48n4ft93da84ms/2099331396.pdfIn PDF document text
    • https://faprosid.com/file/62009231469.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wivonofomod.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/50aacded63174c84719ff9392d3be282/bobegidipu.pdfIn PDF document text
    • http://mopron.ru/upload/files/59240721754.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/674c42c40f3f3c9c9807e3a6b0c6c848/jemezido.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2a427369d3df92e0a42192e501f5c0cc/71624225817.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/rujivudox.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/wezuvemewopo.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/4708898550.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4626d88b---mirugabi.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/9b12cd1f376ac4af462ee52a81caf00b/4655633239.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/97406676420.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9415937a6---51604289434.pdfIn PDF document text
    • http://ranch.pl/files/file/mupupoxutofunitepuvudufu.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_off00010bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001240c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240C 17380 bytes
SHA-256: 784aa05a05f92b75d933665d37abbc6824f91c11bb975296060c98268e6b25f9
font_02_sfnt_off00015136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15136 11036 bytes
SHA-256: 3a5635a6c0f7801b4b48ee16cd79dcf5b51ab11a274b0d114e0f9b5fa43c23ee

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