Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5180523d129c5ba…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 03:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22873310da8daa3e51bc0fce30c9e45b SHA-1: 17f9e540d6e70bce16c3160c6ace3140ed849887 SHA-256: c5180523d129c5ba430f96eaa9cbbcb8cf97a3810ed50372a5f263870051a0b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code or redirecting users. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised, indicating a phishing or content-luring attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://omeofest.eu/userfiles/files/56121667373.pdf In PDF document text
    • http://hoteldanang.com/uploads/images/files/97938314484.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/nabora.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/molurusugiwutuf.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/vamug.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/vigedezujomefavaf.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/32822609809.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/76822955523.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265beef6da---46823488991.pdfIn PDF document text
    • http://sarna-zapiekanki.pl/ckfinder/userfiles/files/30552833748.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/fabazopajuwokifuruvo.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/79751491678.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/filuxobujeritagijidozezix.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/44621562838.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210908230122.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/vaxem.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/gisitizerevirisime.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hthcrnlm553npqqlg3q4i4dkd7/mudopo.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/66707416244.pdfIn PDF document text
    • https://hobbypet.cz/files/file/3615894668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+robux+for+free+by+playing+gamesPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/18967272493.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_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 11232 bytes
SHA-256: 8c1a5b0e42f45fc33072cde91af17edfe36f5aa9662eda6d536fa83fb76e6e71
font_01_sfnt_off0000eb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB77 17588 bytes
SHA-256: 1850a880984edeae72b9afbc5dcc49a620a39fca5c67817fd7266300e1fee2fc
font_02_sfnt_off0001192a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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