Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ce169a972d1616…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 06:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a90af1e5d747fe431e02a923e718c5b SHA-1: 2ce3a8c20225adc245d00adc35658b53d2da0b82 SHA-256: 56ce169a972d161696a8a6bcf0bd7ef31ef9c0c564c86ac42155a49880116b7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145fd461d16b---toziledalorurizitejiwav.pdf
    • http://finalstage.biz/js/upload/files/vapuxufobuwewunifemav.pdf
    • https://sentinels.ro/userfiles/file/kisiwosoterinufematokaken.pdf
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/suvuvotonojuluvesug.pdf
    • https://rallstarawards.us/nbloom/fckuploads/file/pukozojonijiwefojowexez.pdf
    • http://patronusalapitvany.hu/public_html/upload/37304442239.pdf
    • https://saikekanglun.com/filespath/files/20210910055120.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/65c009449a63ed0fd019a37539052450/vodaduvi.pdf
    • https://komunalno.vrgorac.hr/files/64803632924.pdf
    • http://ricettebiagi.it/uploads/assets/file/81734238248.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/vikebi.pdf
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/38197792678.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142ef3b07b68---98168069766.pdf
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/6236507145.pdf
    • https://pepinieramontana.ro/ckfinder/userfiles/files/nelenunisu.pdf
    • https://kvizek.hu/ckfinder/userfiles/files/30481373568.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/sezifixorag.pdf
    • http://fotofolliasanlazzaro.it/userfiles/files/dilufibon.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/kawijosemubawovarijusim.pdf
    • https://ssmavidiyar.com/public/content-images/files/madulixat.pdf
    • http://chamdure.com/DATA/files/renoda.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135526c2d217---saneruwigob.pdf
    • http://aaz.sk/editor_uploads/files/jesasakolopetovuvakipelav.pdf
    • https://behbehaniprojects.com/uploads/files/84576467831.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=purple+cam+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c762.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 16792 bytes
font_01_sfnt_off0000df74.bin
13e91f3567f4ad3091b36305354640716e64540ebcb7ae953dcb2e569f0ff490
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16768 bytes
font_02_sfnt_off00010aa9.bin
193470cf80ee3d9dc12024de0bee0258e96a868f73bd287156fdf84c37b5bed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA9 10148 bytes