Malicious PDF — malware analysis report

Static analysis result for SHA-256 168ce5e9969dbcfc…

MALICIOUS

PDF

75.4 KB Created: 2021-06-26 00:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ff16a90ab83e59784b1575662839a3f SHA-1: 2d57478f5e925a8fbeb85fa25ece7de0c50e12f2 SHA-256: 168ce5e9969dbcfc00c8376e21997ad7fc299df3b899cd58c3fc41fc3edc783b
96 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier strongly indicates maliciousness, and the presence of multiple links to potentially untrusted or compromised sites suggests an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 5

  • 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 http://efuegypt.org/userfiles/file/40125944822.pdf
    • http://akcjonariusz.com/UserFiles/file/58714078566.pdf
    • https://cakenepal.com/userfiles/file/99012527772.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca9c1c6d5---lunizajadoroxotiwexi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d12040ff1---jufipudi.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/caa8ea09fc32448791f05faf73be16f7/pexitudomovekadak.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ed687784a---mikumilatipi.pdf
    • https://fallsplat.se/file/54008090046.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977eacc14a2---kudusesasewifiz.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160add0ce6bad7---fugifod.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/0fedcf920e96e4c6180f303608b5723e/fopovogibufa.pdf
    • http://cappellastudio.it/userfiles/files/xavev.pdf
    • https://aprilboya.com/userfiles/file/41689477594.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/vozaxowa.pdf
    • https://prawobrzeze.info/userfiles/file/24560320565.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bc382ce1ddf---redekekunomikut.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609236f8461d5---86056981840.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d085cfd62---kipifaxuluxixixawerafev.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/coetcplqdd00el2d5mffampuuv/gesutelurifixerabakasete.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ttsc70e34ifkr4rc8j042dsfue/87523147435.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086f36ff07a5---20247406837.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e41de3edc3---12500469730.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb155167b9---20875439119.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609468c84a833---13311449796.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/ja6tb8hc02rudnfbjens739da6/dipexamoxaburimafeni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=questions+to+ask+to+make+someone+fall+in+love+with+you
    • 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_off0000c59b.bin
8f0b5461ddb94077caf7c0c0cfe830cb765ec071adb70f24f833604cd83cd3f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xC59B 15912 bytes
font_01_sfnt_off0000eeaa.bin
fd6012c515e1f8dfcfda61108cf57e7b396825faae8e046cad839a5ca0a9e204
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 10896 bytes
font_02_sfnt_off000107e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x107E7 16792 bytes