Malicious PDF — malware analysis report

Static analysis result for SHA-256 effd3a0e2f270fc4…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 04:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a0287a4d232afcb7574d22ec50897a9 SHA-1: 8c3be81415c6b566104fb1418bd8a2db7989b336 SHA-256: effd3a0e2f270fc4d8acbfce2d84f825bbddcdc6c4029a576c1bf87ef886596b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://philabc.ru/uplcv?utm_term=download+wombo+app PDF link annotation
    • http://propertiesforrent.com/userfiles/file///5069045352.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/tamaxododafanuwom.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/62054839507.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130e88c20e8a---18487950051.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/21337198099.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/vosew.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/laberutamukepijugo.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/44501303691.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/40290574344.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdaa0a1948---42096853088.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/51119137473.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210910_F468F87B250FB761.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/91222781615.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/48765259002.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/21371248c11bd9b7c4355e20226683b0/94612078885.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/febowovibefosulef.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/2329775461.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d00f47aece2b29268c767988aa380a75/78195895991.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/begajukogifas.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/4f912063b404c5c52b28add4a1ad5ecb/96105498333.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/43170353640.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nuwabumanifaset.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/teletaligalutife.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1B 10192 bytes
SHA-256: d60f402c0b6059e4e46feac831b53dc5aaddd4d963810cc227dcd2579df52918
font_02_sfnt_off000105a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A5 18104 bytes
SHA-256: a3c7192ee6699044e0b82997c3a6b622de28b381ade4a2d182c748a95b9f0aee

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