Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b0cd77824b2aae…

MALICIOUS

PDF

85.1 KB Created: 2021-07-16 14:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b2e795cd3de8cb6d7d55e40a668a22a9 SHA-1: e9d0dacda56cbc853ba5c44473f3079919fce3a2 SHA-256: 04b0cd77824b2aaed9d0633a9ebe0fd935c9379f67e0ff461873b6a51db906af
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and links to compromised CMS upload storage, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites, as suggested by the presence of UTM parameters in some URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=need+for+speed+most+wanted+2005+full+game+download+for+pc PDF link annotation
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oa8rsdktj076tv66c99673gpg6/muduvawevobapig.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusako.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/44463504259.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6686998b3---33584535281.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/10432476650.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/fdf417054e9f25343eaaeb13ae2b2dc1/387861644.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/zumikosukijeja.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/najari.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/648e6bd9d032bd4668a649baf26a94fc/59191798893.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/jazejaku.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/jabofuf.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b5c1bd5a9---galepog.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a5d113002---beruvelikabevaxada.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/seguto.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/e1691c4d99f37e3be0710d116d49415e/93851529360.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1g0eth7acfi3cjvngr5ph6jj80/98913146626.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/hfmpsh9q0q4v7h5lepv71posrl/wuwififurov.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/ramewupekogijepumot.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da33f9ab45e---28940256865.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/lenenote.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa087c13d4---gulofubakodokiguxamufunur.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/fininazemitegutiwuvumipu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/f849fr2s4vvv5jbg6ia918idp9/xevafapokota.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_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 17600 bytes
SHA-256: 80043dece33247dcf5512671dbeb2ebb4457013270f30de2df68a72d8b621ce0
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 11412 bytes
SHA-256: 1fedb64db3f5a533a380bc6048e83d9c307c98678bb55f4a8113341e3d675a29

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