Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2764d884c4670e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 16:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3828aa96368e4f42c65d7ac2739bbe3c SHA-1: 490e5fa479e3fae10e75d8a9a632fe3e0ca8dacc SHA-256: 2d2764d884c4670edfb2e303178868873855b100b6587b92e6f0c84472e78681
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a vehicle for the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://abwplazaview.com/uploads/files/20743691616.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa1ea4186d---28665364126.pdf
    • https://hyundainhapkhau.vn/upload/files/zunetilerazopiz.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/1c3cbaa18907dd4b1add5039828c29c1/biduwebepefuregijun.pdf
    • http://dienmattroigiasi.com/uploads/files/ronepewefutogojagar.pdf
    • http://bright-mineral.com/uploadfile/file/2021072606073641.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d11c3550dfa596face2fc8683df20f74/laxowusekiwol.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbb1d7bc86---zatenewu.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b425f219952---48024679820.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/danirovebajejodusomak.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092c7bb10ce2---39228392048.pdf
    • http://n2nlah.org/UserFiles/file/givoziludatidar.pdf
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/17587807850.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/43364075908.pdf
    • http://hopkim.vn/upload/files/sovix.pdf
    • https://watertorens.nl/userfiles/file/17583404370.pdf
    • http://digitalpolicycouncil.com/imagenes/file/zavitufaxu.pdf
    • https://steammining.com/userfiles/file/51388243241.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611efbee96d59---wigarar.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/nekapofofaroraxokuvuz.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/26991593242.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a64ddb0de9e---66730034045.pdf
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/2791706470.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=adjectives+worksheet+ks1+twinkl
    • 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_off0000e6b7.bin
5652efa6fe01ebd6037cc76cd98b8d302fe988b588b3f4c8f197195c22cb64df
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B7 10712 bytes
font_01_sfnt_off0000ff4d.bin
fde4c5480cc150f7a98765e8470a73b3353390c5d0767926ef4e96d9656f0e74
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 17752 bytes
font_02_sfnt_off00012cf3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF3 16792 bytes