Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23199ac29708464…

MALICIOUS

PDF

96.5 KB Created: 2021-09-17 07:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4612d7b61108f94b0b154c3825c38b7b SHA-1: 3ce2af6116d86e0cf76bc5ca72a70780c8896b58 SHA-256: f23199ac2970846401732a77d18f7bb55567a082977c4594235b72e57d31899f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to act as a link farm, likely to direct users to malicious content or phishing sites. No scripts were extracted, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://inwebjor.ru/uplcv?utm_term=where+can+i+download+movies+for+free+to+watch+offline PDF link annotation
    • http://weorderfood.com/uploads/files/73904083806.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/7792720351.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/23288346709.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/navup.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/49317297909.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/subopeforewuguripiliwaz.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5ce7a7jfv9auh8f8dh0956gmf5/11214716788.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/vaxerotonarew.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/jejojakimefobirejezarovi.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/nisuwap.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/pipuderifemujekabadimoj.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/ripinulofitobi.pdfIn PDF document text
    • http://portableandcool.com/files/files/zozifidanido.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210902014642.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/64768854030.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/keludotanotupel.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/9784134944.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/97425142910.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/e9eb3a4b98542bad4de7c9141fd57033/kinewuka.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/wiliputipekanerawag.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/37981402699.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/fijagawagufajilonevow.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/61f7dd112b74600a6b799fae2f1e56ff/pomebemoputuvade.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/vawivadi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/dec4f77699b26c4ad001c30e841d2431/wulezenemepobuvilan.pdfIn PDF document text
    • 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_off000113c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C1 10884 bytes
SHA-256: aa530ea5a2b2582f9eefcad7c87a48d5d87f249807a2fa8108f4faee8b880857
font_01_sfnt_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144DF 18168 bytes
SHA-256: 9e8ffb29fd6fc817ef9ad3db39ebefe5cdf6597202da21ed8341fd1fac67e161

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