Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac267f2e8e8a6c…

MALICIOUS

PDF

70.6 KB Created: 2021-10-09 04:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8a96b616cfec91c53968b0624bf62a49 SHA-1: 9e2bda155d41eff8ff3c39537545ca63a1267029 SHA-256: a4ac267f2e8e8a6c7b37c47ec506997412bae8200eb62b8e3920d712985e9eb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a large number of external links, many hosted on compromised CMS uploads, indicating a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=force+and+laws+of+motion+class+9+worksheet+with+answers+pdf PDF link annotation
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3c22e82d---86814581111.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/zopanaxevuzagode.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/kavixumozaseralukomeb.pdfIn PDF document text
    • http://geotersrl.it/file/5821547265.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/mekumijimet.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6774bd56c---62636684981.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/66239279.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/52313954406.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/52800050135.pdfIn PDF document text
    • http://twilaw.com/files/files/88250650803.pdfIn PDF document text
    • http://sivam.pl/files/file/jufukezisiro.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/zewolojem.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/66bddef33bf4740c8a4ebf0f14a29d6a/wijozutobut.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/91365167251.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210917000847.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/majax.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35920013683.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/93313335524.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/vepelatuvavunafi.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/2709667390.pdfIn PDF document text
    • http://cosyromania.com/media/file/wuwibeguzu.pdfIn PDF document text
    • https://proia.bg/userfiles/file/98787406829.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/79093756951.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109302346233685.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/sagibolokojenanogo.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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 11208 bytes
SHA-256: bd237473db353a1bf0fe63070f80705c37f6bb6fdcf89a1242ad4e094b816a17
font_01_sfnt_off0000ce59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66B 15040 bytes
SHA-256: 4c181bc4d1d1d6cbe7d25570384cd8c00654501e30019dc7e8aca17fea3135d5

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