Malicious PDF — malware analysis report

Static analysis result for SHA-256 0164a3b1ba3c3f25…

MALICIOUS

PDF

70.8 KB Created: 2021-10-10 16:42:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b114171838ea3e6c0164e3f3a09b262b SHA-1: f050df3640e0a8db3a95742b29c8b740b3d42ffe SHA-256: 0164a3b1ba3c3f2522ecd9b016c7711022ba74066010f58f9385b4e60d8f8517
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The primary purpose appears to be to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://ozora.schaffsen.com/contents/file/titovotoxisoridodozafideg.pdf In PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/85320334269.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/63986005948.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/59013406743.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/76056133800.pdfIn PDF document text
    • https://apra.pl/files/file/31316087134.pdfIn PDF document text
    • http://xsteelstock.com/d/files/9425517877.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/vozuliguwavijix.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/87594473014.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/89001268912.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/sinulejimadewu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/jozazenunigumabonul.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/8a627718a4975996af7c321cd114411f/danegofumiwanetevefuwo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/a711a323abc91865c4b9babd8257296f/57008913038.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/45189608153.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161374e3678b32---begoxowefovowulonazo.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d55ea8b5d4---zesid.pdfIn PDF document text
    • https://mikludava.lt/images/files/84600419517.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/71818145219.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/kimibuwusatimiboraxubokaf.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/97436887345.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wozewipomive.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/37976812618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=compendium+of+physical+activities+2020PDF 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_off0000b550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB550 11340 bytes
SHA-256: a00e14b75dd9b6bbcd4371a2b95f68ffb74d7c0dbf2d6e62fd2da9c0ffb58d41
font_01_sfnt_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 14700 bytes
SHA-256: fa3f502757f07a7710cfe6ee235a101c9788314bcaddd00be383934b704eaa73
font_02_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1