Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7795d28b6552123…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 01:10:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 50062934fdd146ca776150e288c94ab9 SHA-1: 8840fb68f47d03ac0516c8184d44f3cefc14ed96 SHA-256: c7795d28b6552123650714683e63108aab0e4b220d130d7f61484465a9686441
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm pointing to multiple domains, including one identified as a compromised WordPress upload storage, suggesting an attempt to obscure the final destination or leverage compromised infrastructure. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://needlugs.com/userfiles/files/tudovesugumazurebavulix.pdf In PDF document text
    • http://viprealestatebrokers.com/userfiles/files/13342051175.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/58760596299.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/beriwu.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/81605903603.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210904220035.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebefe05e19---27198108189.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/48hdhp3rlbq7h6hopaooqaaaad/26614759697.pdfIn PDF document text
    • http://huefpdf.org/upload/file/lapamixexiwebijama.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/jupoxi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6d13c56bfcfcf4845aa395deca8079da/fokojudiremudesuw.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vipubefoladana.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/21092308483652092122zgz.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/6434677250.pdfIn PDF document text
    • http://elsped.hu/files/file/49470604791.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/7197718897.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/28696576349.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/85250592675.pdfIn PDF document text
    • http://scsychem.com/upload/files/fugonores.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/93865149517.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/tidukotoga.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911060109.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/fegudakonudivikalotudo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e43739fef---tuzumutusoroxegumijix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=arabic+ringtones+for+androidPDF 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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA89 10728 bytes
SHA-256: df2a936f4fefd739a052293f943caabc894fc30cf0d9a03cb4abd66dc07a7165
font_02_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 14928 bytes
SHA-256: f4d9d0ddf0e45d2636691f4bad151b7c309c07c4adae6cacb8e3422f97668185