Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddd95fe69cad147…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 22:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f97ac4b6e3697a21fbcf45aefc935a73 SHA-1: 5d3ce9e9f777bdd528dc8ccdfb917427cfabd168 SHA-256: 1ddd95fe69cad1479d0c4299bd96d7bf03c3facbffffcd527b25d899425d5a5a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these links for malicious purposes, likely phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://olivetheater.com/userData/board/file/negakevajekeropefebe.pdf In PDF document text
    • https://pnvvr.ro/userfiles/file/36945449864.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ff989325c02c68a764ef84d632eccec2/dawixolefejo.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/57413747057.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/71696941527.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/97006411105.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/38624259063.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/loraxutimugaloguzirun.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/32864722280.pdfIn PDF document text
    • http://sergeybazarov.ru/file/juxepetimojatupad.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/15581d546b862930ad3511f74b3ce432/59326244731.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/sogebixiz.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/84021067268.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/7742739714.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/bidup.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/kitezeguxe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161303c78ec021---deworinokumolakufebesodif.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/51308017552.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356f967ba02---10994811735.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/33704918423.pdfIn PDF document text
    • http://kleiberit.ru/files/file/gezalebimosutod.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/suwewazofulane.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/47984202045.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/18776566353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ludo+king+6+players+apk+downloadPDF 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_off0000e087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89E 10984 bytes
SHA-256: 4187507a8c46040ba79b240d58290a68c11165f2207398c49230f2f5c81d62a3
font_02_sfnt_off00011218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11218 19668 bytes
SHA-256: d6710654dd3f2acca548b453ec60242cb1f1431139503eba2164428a7c6262e3

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