Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c49a78cbf22d33…

MALICIOUS

PDF

97.2 KB Created: 2021-06-25 18:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e1d20e3750a34ff71e59fe27e68a1fa SHA-1: e470bb3a508a6b588c3c94c4acaa14313ac57ca4 SHA-256: 15c49a78cbf22d335e4ac8e420ee08042978ef052b0c2d8a8bed41eaf2459bbb
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/63f34e3c8df864a9b6c1d02f83a09b27/52665850018.pdf
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/r7gb9m5mhtejras85emgsi53q0/84000623679.pdf
    • http://buergerforum-tirol.at/file/vipanunojonuzegubiluxor.pdf
    • https://sambelteri.com/contents//files/47873049899.pdf
    • http://quaint-house.com/binel.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607585b04267b---73424437325.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/ts4c3vgqrgf0g4dsrpr0j7simu/pixinekukonix.pdf
    • http://sillajen.com/fckeditor/_upload/file/ruxabafexediwupe.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706efadf4ab---44092244525.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/519d37d1629b17bdef0ab06b8fe34efd/pekosonejitiwejopozufuved.pdf
    • https://clickkedai.com/userfiles/file/9536445844.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/91881127413.pdf
    • http://angelcabrera.com/FCKfiles/file/45102171278.pdf
    • https://lukili.ch/UserFiles/files/64643280233.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kpm9e077lcq8obi323b3eq2ci1/fitoga.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c3fc7928---93742827222.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/8b0jq9jci7ri1ha1r65468au9v/1063754445.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/55d1df8506375188ba5f67d1ce19b1fd/72098700755.pdf
    • https://lensprovn.com/ckfinder/userfiles/files/42261861670.pdf
    • http://train-in-japan.com/images/blog//file/fuvokoxiba.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/6epvbh2dvk2a7q9mtn7703isv8/29277654700.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16084a45290e39---42652863853.pdf
    • http://gapoom.com/upload/fckeditor/file/83921044581.pdf
    • http://ashioke.com/images/library/File/54431876691.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8qp59fif55n8j6a9m2vgc7lujn/75387425900.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/s9e1gs3o9ooo13keeqd9bb2s8e/60587349865.pdf
    • http://clubchic.lv/c/i/files/19900493617.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081729719f1b---93945625916.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=ds+5038s+samsung+manual
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001096a.bin
8c5a3fdf6400ba7fd51c24b78a4f6b72a83424c16fe1a88fc30914cfbef9d7c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 10648 bytes
font_01_sfnt_off000121c8.bin
fea5e71f9c792b5a849ed9aa4a92822fd17df4af38acd24e8d11aebf4a22bd16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121C8 23816 bytes
font_02_sfnt_off00015f3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3F 16792 bytes

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