Malicious PDF — malware analysis report

Static analysis result for SHA-256 2311fc320fc51dce…

MALICIOUS

PDF

71.8 KB Created: 2021-09-30 18:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03a50d98fd36db70d95ae946ac018cbe SHA-1: 23c70c972cc96b6bea64c4911f9da66ca66d3e14 SHA-256: 2311fc320fc51dce6bc1ca091e1e3cf02fb2d6efb54244ef2f3d61c8215da945
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. The embedded URLs suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://assessmentinsight.com/ckfinder/userfiles/files/17659056685.pdf In PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/58812288661.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2cd15c53---69151349191.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/mepizuvutu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d78e2ddf2054b538474fb8bc6a0e087/batidoset.pdfIn PDF document text
    • https://cmf8.ir/data/file/koxox.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/bosixegefiremukukis.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16132e57e8afff---25256812217.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/69246095172.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/juzatumelizumibekam.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/79883666881.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xujudaleg.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifojaxi.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/37159396718.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/30789034934.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/nebunafoxesit.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/35294a6929ea0f250677584ed8d6ea54/28073277808.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/57060163243.pdfIn PDF document text
    • https://gtijsr.com/userfiles/file/27883573418.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pukipad.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/vomosis.pdfIn PDF document text
    • http://www.toptehnik.si/images/79938849119.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/zonen.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/vesurimaxupaxafuwo.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/9803633607.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=redmi+note+10+pro+frp+bypass+miui+12PDF 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_off0000b221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA33 17552 bytes
SHA-256: c2a161829d3d4997e8335257dd76791a392c42c010004ff089ff114ba0bad71b
font_02_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 11304 bytes
SHA-256: a96f7b9b57102b138a320c432721fc33f1417090471167d02de64b07ddd4ea2d