Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd923019e1141e4…

MALICIOUS

PDF

69.7 KB Created: 2021-09-27 07:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bc525c2b0a72f9ec9c99cda51e23ac8 SHA-1: 2d6217bff9c529177def4aa1cbd4bbb449b849d7 SHA-256: afd923019e1141e445b8818d167da968ab1d8ee9dd1d52712d078c45244cba3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/22011559040.pdf In PDF document text
    • https://isagrinio.gr/userfiles/33568989715.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16139d5c674cc9---gijuwiletulalupokekutuf.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/11491626880.pdfIn PDF document text
    • https://granitnet.hu/editor_up/fefaker.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/70659373872.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/xukemenofogob.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446ff25556b---woviretokikabarewasexixog.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/befumugodumikemopobozukur.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/mosikefinigogakurufed.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/saxegaj.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/jalofujupufuwudupun.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1614f90ae17e42---koludirufelonevawuku.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/1936653551.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109270548482433.pdfIn PDF document text
    • http://emannsltd.com/userfiles/11330524477.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/jobokegilibede.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/21671633824.pdfIn PDF document text
    • http://byecook.com/ckupload/files/29877911989.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/wudupodifeveraxaded.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc50695940---puratajosasovi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e25eab7de5c22cabeecd84b0dded95a9/6513276671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=top+five+music+player+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_off0000b100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB100 15444 bytes
SHA-256: b102a533e58283cae695a08a612639d9a233e277d2762a974ede62a2e4935844
font_01_sfnt_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 10924 bytes
SHA-256: be3cb167c81d33b0060cca94afa7a2dde81de6d8eda4da43bae8ec7c5ce4f4ab
font_02_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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