Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325419b7bad7207…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 22:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c893d142e632276211b48b60a2a5636d SHA-1: f4cec2ca66ca27554608d15c99788e47ee33813c SHA-256: 4325419b7bad7207647a350067dddbaef33ccb77b197fb3cbdffc27e1fc3e7d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, and the PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggests the use of compromised WordPress sites for hosting. The primary URL, https://smidgel.ru/uplcv?utm_term=tubemate+app+not+installed, suggests a lure related to software installation.

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://smidgel.ru/uplcv?utm_term=tubemate+app+not+installed PDF link annotation
    • https://fiberglasssupplydepot.com/userfiles/files/59825284725.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b774f1fe87---kupizesebali.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/91649961459.pdfIn PDF document text
    • http://laserbeautymachine.net/d/files/58001148795.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/53605021242.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/3785403557.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/gawugen.pdfIn PDF document text
    • http://toflight.mobi/attachment/ckeditor/files/82b98f33b3150d8addedd99deb8a7efe.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/95620982461.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/relonufox.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/xigavebimo.pdfIn PDF document text
    • http://elfast.ru/userfiles/file/46435587384.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906012638920586.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130f8d0ee780---sajojasixunanutoledekape.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/robira.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/davajifajorovulafatutom.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/63178877953.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/litaxevirad.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/43521367007.pdfIn PDF document text
    • https://jjpremiers.com/files/gadibegubagoxexinepupibod.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/31145440303.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee4c3dadf3---mobusizerivabibakinifene.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/xajizaderemize.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/64587914914.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/xomawobugiwa.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_off0000dc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC23 10656 bytes
SHA-256: 915b8191cc76c775c9e26ce3426dad133a684736b23f4774f0597c1b22cbf8c9
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5F 17832 bytes
SHA-256: 44ea6092f83bcf5dc2ab043658d4e5db9658ba14ac48fd7b0d061aa81c0b0dee

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