Malicious PDF — malware analysis report

Static analysis result for SHA-256 959c768a91143251…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 08:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c02adfbab82d27ca93fef1c1c789dd29 SHA-1: 43d44475937b3927f1440210112af97591ad5b46 SHA-256: 959c768a91143251ad42a5f201db610db1e7bebe4c6296e3c75f490191a43d2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The presence of JavaScript actions and numerous embedded URLs, many pointing to compromised CMS uploads, strongly suggests this file is designed to redirect users to malicious sites. The primary attack pattern involves leveraging these links for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://lapalettedesarts.fr/gestion/file/81045592368.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087469d91b39---61496135307.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f771009---moxapuneropedofo.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bebc96d1fd512ca8d1691358a59542a8/86370395986.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/27538519882.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9d4e61e26168e63a190637485ad55135/kodunosip.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/66294609186.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161002036f2045---mixovawidifurakavif.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf941508dc---jexipuzakuberuvasasabej.pdfIn PDF document text
    • http://wohingltd.com/userfiles/lijido.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/91235057915.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e807490e49b---kakapinuzinidodimituzan.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/tokedamikexewidenafab.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/79846245352.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718610d1a69---duzuwatisuvofige.pdfIn PDF document text
    • http://prograsifkalip.com/files/fisarilifebodazarega.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/98877821717.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/simoli.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/62180388474.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/45934520334.pdfIn PDF document text
    • http://builderall.info/userfiles/file/zivuvoburojuvididiv.pdfIn PDF document text
    • http://inspirationforexcellence.com/clients/66491/File/jorodorofewiku.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/80544755338.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/vezafasenelutagag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=bookkeeping+and+accountingPDF 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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 17176 bytes
SHA-256: b207552d307bc2f2c9db6bf96ed6863aa8e40fc7ad82ea7e41167344b150cff4
font_01_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 10620 bytes
SHA-256: 90555902760fb59bed9b9f6207638fc6b9cbfe8a89d5c2c2f6b127a24d233e65