Malicious PDF — malware analysis report

Static analysis result for SHA-256 2703d584e93b3a87…

MALICIOUS

PDF

88.7 KB Created: 2021-08-24 05:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0d518aa03623abe7205585d1f2de2d69 SHA-1: 32849e70c2c1253f99a4d28236aadccaba7c93bd SHA-256: 2703d584e93b3a87b19075e54898a47e7431d9b200a4fdeb51bea9c8515fbd04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://7onseventh.org/clients/868256/File/60795642911.pdf In PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/e42o634cmqocug9r0k092tbvdf/44990466657.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/34161634117.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607325a94e932---lixisif.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0hf4ur9v6111ruddh4aqplv2m4/51386842813.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3d8d7c2bbe8bb86ddb4380769cb2310f/15460817649.pdfIn PDF document text
    • http://com123.vn/uploads/file/kuvozokasogabopedinejula.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/xuzokinewiko.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085878b2de16---fetuxijivefigofat.pdfIn PDF document text
    • http://angeladaniel.de/uploads/files/30947342517.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7bedc6ee3af4e61ee5851c60bc1241b2/xifigizo.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/bebagidarirudobodugul.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/witetudimujexem.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/pujojigixisab.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/90878296563.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/58939043484.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9d28511540a99e9ff32c83ef23beeaae/wubolewamuwiwuzusoruwode.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/24c0ff0240c25bb146cb3e693b6472a1/gupopagel.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/94812100437.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/081336011902.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160c671e884268---virazoxixevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=emergency+c+section+costPDF 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_off0000f787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF787 10464 bytes
SHA-256: aeb9ee306bd2de6f211eaaf6de0a09704c8cfe414b4004bec4e42a81def6d521
font_01_sfnt_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 17300 bytes
SHA-256: 859057d1e38fdd72872596b9e2813153d31419337b792929f7bfe60cf82a2964
font_02_sfnt_off00013c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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