Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa3819a0b89545f…

MALICIOUS

PDF

99.5 KB Created: 2021-05-06 02:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 987bd6eb457fd23a3ca7a7bb6801f888 SHA-1: 682e4b894e9753f24b49450542b42f08acedc36a SHA-256: 4aa3819a0b89545f3ba824961a6796c9196f21fa89a86677648c53df9a4d5e97
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a worksheet, to trick users into clicking the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8775

Heuristics 5

  • 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
  • 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.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607382aad1a42---geron.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5b11bd330---91362631710.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca86229c08---rorupo.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d866f3486a---resowada.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c9bf2962709209d49cabf36ca44a6c4b/poxiwuwakimiluja.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/5qrqegn9qoa60a6nc6p6krstn0/63634857539.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16079eed414d1d---vasowufopijijutimonumaxog.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5af19d2ae---69518992431.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/76ef0c521af9e38517dcf1913d49e15b/66902398883.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085e019d1d53---timanexaveda.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/1594873d212d146b607a3079de67e600/46398694684.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/54065868005.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9f1b19a48882e2ec78e80dbe5c5c1938/45178638100.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa9e729354---87132736879.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f9de310700785ba91df672a41456c263/12004800986.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/k7d832fng39g0cid38flob84d0/23727873094.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/187d249110ead6b44653f30332b35136/puxosajizogelavirobalire.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908de789f02---986918669.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cladogram+lab+worksheet+answers
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c841914354e3d15e6e13004f72014632/wolenigawopudomif.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015683.bin
a11e2bfa6738374acdf9fb01bcf2c31f2b68add419d8f903e85c3e29f034bee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15683 5440 bytes
font_01_sfnt_off000168e1.bin
368731e31a95c8bb06723617c8062888fa9509bf04cbd40f72bf6b4cdb1d8322		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168E1 12872 bytes

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