Malicious PDF — malware analysis report

Static analysis result for SHA-256 175ec4e470684c6c…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 20:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fa9d02b8ca5074903bb46cf1a840e8b1 SHA-1: 120b7c8cbf17905944df2e7fc5aa2337b90144fc SHA-256: 175ec4e470684c6c5e4e26f5ca5064c3a14889aa480febf6a81de5eefb6dbd6b
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous external links, several of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or malware distribution lure.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=pc+das+english+grammar+pdf+download PDF link annotation
    • http://orgue-chantepie.info/FCKeditor/upload/file/desenarivarivufa.pdfIn PDF document text
    • http://innotack.com/userfiles/files/raneririw.pdfIn PDF document text
    • https://angkagenap.com/contents/files/98497710379.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/refimube.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16140a212b248c---kofufaxavaguwejowip.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/finowusenokeladifoduvoj.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/zomokijir.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/942fcbcd56497a165bad75a861c4658b/88736008490.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/mitotujivoturu.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xupogopewafi.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/51970738308.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/nusoxajafizumexowi.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/maditisanonuzozixixuropi.pdfIn PDF document text
    • http://trevorhannant.com/16911748037.pdfIn PDF document text
    • http://net-work.cz/data/file/lemefekajapukozadotabobu.pdfIn PDF document text
    • http://www.toptehnik.si/images/56574491976.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af2165a2d---dajapipesuvomu.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/bogeginisi.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/dodim.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/tipasevililujevid.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdfIn PDF document text
    • https://kham.vn/userfiles/file/73335305695.pdfIn PDF document text
    • https://austarpharma.com/upload/files/xedor.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/xajapufizabejewolefet.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_off0000bbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDC 11056 bytes
SHA-256: 7b4f58ee63e5127b484e17591ab90818b10976054cdbaccb31e32cab3fecb919
font_01_sfnt_off0000d532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD532 20416 bytes
SHA-256: b813edb05a867747133f0aee2b0c0a947659560fac2b3bcbcca5cbf6a655ba25
font_02_sfnt_off00010aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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