Malicious PDF — malware analysis report

Static analysis result for SHA-256 333aa6dbc60dd88a…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 05:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: de072e6017f2f0cb6e5962596791d300 SHA-1: aa2f9ae06c841dffe296e46cffc1d406310d3b77 SHA-256: 333aa6dbc60dd88ad20780ed4c6f3fc1dd3063a8a5b5f90c9e0deb1cebf1b822
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://ecole.ru/text/images/file/74033799966.pdf In PDF document text
    • https://egyptsuntours.com/userfiles/files/farazimokebironemuvibit.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/104dbd2e05335f5dc07dfd39cdd36cfb/dadaguvoj.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/2t1fip4ge4los332utgmogmd72/xobowe.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797f27d76eb---60539039378.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607df724b0951---91424274938.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094c26d8d7a2---xawufarevupodowifopoxaw.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/wutulevix.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fekidexaromorevosejefome.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/86274eb8815cc6a69a5896559ae56744/77881910116.pdfIn PDF document text
    • http://lucavolpicella.it/userfiles/files/zopamabuvimifib.pdfIn PDF document text
    • http://hodori247.com/uploads/files/85530370632.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ae81c8666---37053219502.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/veserujiwawo.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/lisibogej.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/75109663b0134f1f31df5c205829f792/56925190172.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60c14ca0208b0ab6b931fcda4424f8fa/58116239034.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ccfeadc2044---jerurezi.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/566cfff764310c63e4fa5d279d1a8e51/79592326207.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094d006e94d9---jajum.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/novujodimilijasexurof.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b67cb1eec---zufalotusudejokegi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/7347b3cf0bcafceb8e47eb2964c5cc3e/pewakuwonoxawu.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/03cd9281646c9a084995a5aaecc32ad5/dipebitap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=decompile+hex+filePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 18808 bytes
SHA-256: 3ba8996ab1bc6ef109e58b9430057f1a6a7910166830015c6a4940859cf84ed5
font_01_sfnt_off00012007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001381e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1381E 10216 bytes
SHA-256: 886ecd11a292e2408e9c866ba5d3deffbd7321cb981678389ed13044e86f324e