Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15810ab15ab143f…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 19:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc4db9d6e59fbfd45bc7a07b6698eb65 SHA-1: 620ba35bf1e55a62fc6cd7a37a048a3e01360a14 SHA-256: c15810ab15ab143fff827eb8dd9326da8a952226b4976bd3c9c07734d604fa95
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a8213f52---jeruwote.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/13457370210.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/butegelotota.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/8262008276741f90d8c2315313b9b6b4/29372945209.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/virefukenopeko.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/susejunesuxo.pdfIn PDF document text
    • http://huefpdf.org/upload/file/gujetojumovazukakofop.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/jujegugufojazusibirofu.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/20201924662.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/76248257299.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/goguzekekixekafadaxex.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/bipopekuwiwig.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c727e6aa3---3953073555.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d42db4bb76---16633588917.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab072026---88884329947.pdfIn PDF document text
    • https://digireg.lu/upload/59359783640.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/21616430846.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/zuzenesekizosugawi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e29fc3e50a5413f8d090535e5128faac/zitodovezix.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d03fd43dc5d022d12b7d97b4fd958206/18177719068.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630935312.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=real+apk+modPDF 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_off0000e03e.bin
6271ed717c066f980ecc6706499ec626211ebd2b12e4bbd7a7773603fb5fb3ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03E 20616 bytes
font_01_sfnt_off000116a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116A1 16792 bytes
font_02_sfnt_off00012eb8.bin
ab73abf3c420f449da20ff287df0cbc9bae7f26e9cca7d0a5f4d56beb5f7beef
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB8 10128 bytes