Malicious PDF — malware analysis report

Static analysis result for SHA-256 66964ea31cc03757…

MALICIOUS

PDF

90.7 KB Created: 2021-09-15 18:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 96ea7aaaf20e81458285e19fda26bcc3 SHA-1: 6306e2c6a7544318a1596da67d81990122044641 SHA-256: 66964ea31cc03757525d1f02fbaa29c63219219de130cbecb2db4d530a25ba12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://pixomot.ru/uplcv?utm_term=live+football+hd+tv PDF link annotation
    • http://ansing.nl/userfiles/file/77335676087.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/789cd965bf972bf380d08a0768231abe/madelavavejifu.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/duxukuri.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/bewonapopofom.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/depizafosakapin.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/fozobepukofesa.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/10507307258.pdfIn PDF document text
    • http://regalmotors-jp.com/js/upload/files/53022276736.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/95248930811.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210913040727.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/tapovezawozapepigis.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301fc69df00---jinomuxelajorokoxiwu.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/kafusumefoxanowurogasaz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d10e71458d---nitutuvijeze.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/bozukerubijamusuwajabe.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7ea596ad730538c3d853506e0f7c3b9f/wubanudoj.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/84441668877.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/33597417448.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/xemizovapufedorarir.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/99413921231.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/60763655989.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/divikadene.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_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 10244 bytes
SHA-256: 2147ab9ae6b250b60f6bf8f0c2afc0c42e393574fc033a2886ff3ba201924bdb
font_01_sfnt_off0001175b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175B 17796 bytes
SHA-256: dab61f045a434dafd9ce17632aa3697dbb5cee59ec2eca975b9788734c4b3ec5
font_02_sfnt_off000145c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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