Malicious PDF — malware analysis report

Static analysis result for SHA-256 3340ba4dd4a1d35f…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 06:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07c206a89e38ce148bc7a5cfcd411d9a SHA-1: 3e8e24ed084bd9c71a4f47ca7b5b8d376e48c558 SHA-256: 3340ba4dd4a1d35fafb4c8f202cb904665483ad086ab74a0ee658c8ba2b6b837
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. Heuristics indicate this PDF is a link farm, likely intended to direct users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/olplq999eqht4fk5p9d634dn7p/30764616705.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bb06c7a1---tugativajuririnagu.pdf
    • http://roycraft.ca/userfiles/file/bafadelurevodavine.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6b9394f1---robazokutolerirataja.pdf
    • http://fantalife.nl/userfiles/file/876432512.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa66641c2---4031857858.pdf
    • https://alihuata.com/userfiles/file/83276076663.pdf
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/53173471111.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/ab7618cdb25a7d2c389af5bebcfdf7d4/8434781104.pdf
    • http://aryajob.com/user_upload/file/nuwune.pdf
    • https://aduanaldelvalle.com/userfiles/file/86314512970.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6f06d4e534d23dfb541f0a9708c5fdf9/wabugoguvajotawe.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/vosazebovi.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07a67f912---gigada.pdf
    • http://mastera-mix.ru/ckfinder/userfiles/files/durobitu.pdf
    • http://airholic.com/UpFiles/WebEditorFiles/file/48516657850.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0805ba506---42938333362.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/ee437a457f9a5661b6b7c04f90dd1478/lexisejivitegiz.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/aec9f227667f556fde0a3cd821dd941a/memanejoxinijo.pdf
    • https://stratasphere.online/userfiles/file/pitawajifuduwuvemi.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/31471316464.pdf
    • http://learningkey.org/userfiles/lezawiwex.pdf
    • http://newo.ru/files/files/sexofodunopebelagi.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55409c2dd4---xaretotijovixowezimobuke.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cea837872---bigaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=cher+and+miley+cyrus
    • 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_off0000f17e.bin
05aa0a961a6b5a77d89e8578059e7055407d465c15f8333c51155aa71a10041c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 18516 bytes
font_01_sfnt_off0001224d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 16792 bytes
font_02_sfnt_off00013a64.bin
d92a36d8bc18b7e9072fa9a6511c68b825d3ac1e2465fbd3bed9a34d4353fc4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A64 10664 bytes