Malicious PDF — malware analysis report

Static analysis result for SHA-256 2436dbddff76e957…

MALICIOUS

PDF

100.0 KB Created: 2021-07-04 02:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e3f4e12264acea8e185b16c4b9b4ac SHA-1: 69ec2047fbab6c02b81601655c46ef966fa4ffc8 SHA-256: 2436dbddff76e957cdbf6650a0be9ead719ad583e52fa1b1ba673208c34bc04c
164 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download' button lure further supports this. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9817

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=iit+jee+advanced+question+paper
    • https://jamisonfurnace.ca/userfiles/files/kanubu.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/03e60d1cd34243ae6e6fc03bc25480a7/11932500766.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3030b378---18883050618.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc5ec41c---mavipez.pdf
    • https://mavibusiness.it/file/12197243705.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096538cc8515---49319055748.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/gatelofajefedus.pdf
    • http://vetranhtuong.info/luutru/files/mavutedidasiwobonobupiki.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c863ca9390---98171433235.pdf
    • http://qhs1978.com/clients/d/dd/dd8db5a278a7ad55a2ada34b8e38ebcc/File/sufijusowudopo.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc51e6657---59629734912.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/28593996929.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d304539af---fowixijupitakejofef.pdf
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/desoge.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe096a9392---29419869704.pdf
    • https://nbtele.com/en/cache/fck_files/file/kidejigemekelozakeb.pdf
    • https://actor-conseil.com/files/file/57224873011.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/19365837401.pdf
    • http://austral-immo.com/userfiles/files/1901247374.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/nqp9foapann7ti8rra525crutv/vavefo.pdf
    • http://classicalgardenstatues.com/uplds/file/7723989372.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfc2ce9e8de---lajipologas.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b10aaf31e90---laboxevipafalelojanaga.pdf
    • http://loveperfectionschool.com/upload/file/mezibu.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160753b555d901---34144818862.pdf
    • http://minhphucvietnam.com/uploads/userfiles/file/guxukife.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c68.bin
4219055bf5667e954bf05888623f00a906821893e25759e9686a1126c165ce5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C68 17540 bytes
font_01_sfnt_off00013a46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
font_02_sfnt_off0001525d.bin
7ef55d47a3b6660ae915eb4a58b6884dc5dd546c8c3399ea50dea165ac7bf021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1525D 10856 bytes
font_03_sfnt_off00016b48.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16B48 16488 bytes

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