Malicious PDF — malware analysis report

Static analysis result for SHA-256 155b8f351207e01c…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 11:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2401fa18551b396a3d7b09ccebb02d9d SHA-1: dc0acf18e1a3e85a3522f8f9f21b770bbf5486ec SHA-256: 155b8f351207e01c4357250113d1608e9c6bcd31bc2aeec7a9ee8c58a8821a60
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage or disposable hosting, suggesting an effort to obscure the ultimate destination or leverage potentially untrusted infrastructure. The presence of a Google feedproxy URL with a 'csr racing 2 download apk' term suggests a lure for potentially unwanted software or a phishing attempt related to game downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.greenfield-sustainability.com/images/files/68458807917.pdf In PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/65432680107.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/31279189612.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1532ecc6---14204411071.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/ee35320ae2354c4f2548208b376453d0/85619215604.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/69270211209.pdfIn PDF document text
    • http://secretinvitation.net/images/files/zifaluvijoku.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/92318417279.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2afd660085d4e6f710466f80b4b4175c/todawedivolovamajovufe.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/ralexexixuni.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/vilawawewiso.pdfIn PDF document text
    • http://kvrhousing.com/uploads/25350748133.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/91924690560.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/23580940099.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/xifamej.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/93152174060.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/62126106819.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xidej.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/bedomeg.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/39807318280.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/88859219030.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/19896323081.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2aa422ad---gajasunufuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=csr+racing+2+download+apkPDF 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_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10788 bytes
SHA-256: b3fb2be06a054ec4f8fee712d8fdc5ec6521dd9d1c904d7a5ff79cb788d2e8ff
font_02_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 18660 bytes
SHA-256: 68b21b20ea0c75a7e6f478b78e7e100f1dcb8b7512cc24a220b6de8afb60c147

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