Malicious PDF — malware analysis report

Static analysis result for SHA-256 084d31fe1fd526d2…

MALICIOUS

PDF

94.9 KB Created: 2021-07-31 22:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9a4b4326ba4036351266b6c0f5c34b7c SHA-1: 84a78367b79163a952d75877f631e96062f93d43 SHA-256: 084d31fe1fd526d2615364217e18ee1c53394afb2ba56af470d95cf6ab2c243d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, suggesting a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards a social engineering attack aiming to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b45e3132---79623748771.pdf In PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/jogajoropivaxisubutope.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/melobaw.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/nevari.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/jewul.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/24112117809.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/riliwogodawofemiwiguzesa.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/12717d6a2d52f02af046d4965e6c7161/nomogifigika.pdfIn PDF document text
    • http://twxcd.com/img-aim/files/wodelanakemobujupol.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/86211438014.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/20637282080.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/texanovopudibiradolu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bab833e33---99287146256.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xedata.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/zaxub.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb20cb478---mazolewivem.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/widulededati.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/1bb75d2b6635d2e683acdb6569d8a86c/denoxe.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/savebi.pdfIn PDF document text
    • http://finatwork.com/userfiles/file/xadowezibatazoke.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3d9c4b5ef---bifenuzebuxidudimo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/8a3043c54efdfb5463057d06312b404f/57328153305.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/tesapetatazebexapuxuru.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607651cd713e7---tugad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=download+dream+league+soccer+2015+mod+apk+revdlPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 18060 bytes
SHA-256: 4a02c28ae5a51141b066fdc20b328de2f4bd95f1820205576f3934d547569eff
font_02_sfnt_off00013bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD7 11440 bytes
SHA-256: c9a0ed07efcf32763e3416e8de512d689047093ffffe247f2cdc66fbdee0653c
font_03_sfnt_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee

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