Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f2f493e69d566d…

MALICIOUS

PDF

88.8 KB Created: 2021-10-06 10:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c09f9f65b0abc2ea35369a646120ab48 SHA-1: ebab7729a66ab494f0b42b16e79a679851fde6f9 SHA-256: 37f2f493e69d566da9fc6c3f64dd29a62345e5fc4297db00bae8f250a90ff90a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming on potentially untrusted domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the linked resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77cc4f965---24592838570.pdf In PDF document text
    • https://bitree.com/ckfinder/userfiles/files/96026702103.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/xowunutomikene.pdfIn PDF document text
    • https://digireg.cn/upload/2555117835.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/96239864465.pdfIn PDF document text
    • https://kozmetikadunakeszi.hu/userfiles/file/42029581093.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/wadupatopariroxunifo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/ivukasuj.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/70224325171.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/20036086804.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zaliwewumesulu.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/wukovaluxinenanotekido.pdfIn PDF document text
    • http://teresachild.com/upload/files/towagetafazafi.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/fofijutebo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0505238d6---2514017771.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/54407974702.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/fatowanebiwixaf.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/40594214679.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nuwakaduvol.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/sagejuwaxawug.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/28663653903.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/furawetuge.pdfIn PDF document text
    • http://a899.net/userfiles/file/nefugobalozejekabuxubu.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615a6b5faacf0---75335320471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=daily+expression+in+english+pdfPDF 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_off0000ef28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF28 20940 bytes
SHA-256: 5c4175aa68feaeddbe2d8a471c794f9804af0ea22f9a3770e285c10095301228
font_01_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 10896 bytes
SHA-256: 722aa0df25eac503b3e457d65404bf035f08fab569f9abba859bd5cc645ba989
font_02_sfnt_off00013d59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.