Malicious PDF — malware analysis report

Static analysis result for SHA-256 879aa22580976d0d…

MALICIOUS

PDF

84.6 KB Created: 2021-07-25 06:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23b31ccbec8fdc4252ed33bf171f1993 SHA-1: 88aec824bf9a3f8f00bef520890cfed760aac3d1 SHA-256: 879aa22580976d0d022049cdd146d951647177ba6f21370024395e30677fa614
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external links point towards an attempt to exploit vulnerabilities or trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://alexhoffordphotography.com/temp/files/file/munutebiburibulug.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7adb449a62c6ee01cda34577d8b10ff7/15705177458.pdf
    • http://jarosi.hu/files/file/89577102658.pdf
    • http://tikatalog.sk/_files/file/furefufemopajiwufe.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9u684go9iuf58lt0v8h3s2vjn2/22423712174.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/vijox.pdf
    • https://anaksemut.com/contents//files/17612717060.pdf
    • https://aduanaldelvalle.com/userfiles/file/50896029923.pdf
    • http://richfield1960.com/clients/865265/File/nixuvedimazadulosotug.pdf
    • http://beamstraffic.ae/amb/userfiles/file/10781257205.pdf
    • https://kingcarmotorista.net/uploads/files/14027667797.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22325d9ec1---18558136297.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607199924e3c9---bipuxivufufajagavedad.pdf
    • http://fixafilm.se/userfiles/file/10735365991.pdf
    • https://balajihighfields.in/userfiles/file/bogasetijakazivodutafoma.pdf
    • https://cissud.eu/uploads/ck_editor/files/fafipu.pdf
    • https://maintogelonline2.com/contents//files/23119848613.pdf
    • http://pro-elec.ru/ckfinder/userfiles/files/75291130777.pdf
    • https://aquatrustfina.com/userfiles/file/55726773209.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/2d8eda996effb2d6ef1abcb73233a84f/26403074275.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/e8794d86dd1a2c76e78a9269006a8aad/12014583510.pdf
    • http://topas.lt/userfiles/file/takotigeropike.pdf
    • http://pappteam.hu/userfiles/file/78067597971.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=liquidation+of+company+notes+pdf
    • https://bit.ly/3idbj4B
    • 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_off0000e7c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C1 16792 bytes
font_01_sfnt_off0000ffd8.bin
1afbfe953140642957475979825cd890c29e54d3346eebc1d54c78db9ee66de6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 10952 bytes
font_02_sfnt_off0001190d.bin
e3bd5b8e1c24a1654a1ddac9b13e92e2e7a4a2dd415163a63f658ccb52a27e15
pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 16392 bytes