Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9a7ccadebb459f…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 05:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56cffdf48d244d34d4026cf747ba8802 SHA-1: 7d57234802b47d82905f96ceb5810b633bbff086 SHA-256: 4b9a7ccadebb459f38f1a82d589d7cc6e6630a98a9ad6b566224c6f12ecb32ee
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it functions as a link farm to lure users to potentially malicious content. The presence of multiple external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://irlanc.ru/uplcv?utm_term=swain+live+wallpaper PDF link annotation
    • https://abyway.lv/images/ck_images/files/zuvufamipugijedurofa.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/gunamojos.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zefin.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/lg6gd107un82o13bo0tr025fia/kinatumoj.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/zeketulujumuvobipan.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/9928663347.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/79579795262.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/sadapij.pdfIn PDF document text
    • http://zeci.nl/im/image/sujajewuwozifulikele.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/gevufozopikag.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e07a429a68---jajabojunom.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/kumilibonomug.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/9c9d1dd12eefd40c11d176db56f58f01/76411215738.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/10193257090.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/16333962051.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/15399351211.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/xiveguwudulaz.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361129124ac---42385227954.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/63807494127.pdfIn PDF document text
    • http://juentai.com/userfiles/files/pamufavimumoketuvuxisese.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/bewijo.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_off0000b295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB295 10088 bytes
SHA-256: 5b79837e92f644ef71bf86e4f9f0ecea5f5408f3908c13450fc3d08784e047ad
font_01_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 16332 bytes
SHA-256: 1497c8ff6cf492b63d3b05b5484ef7d95e80cdc54cb90d90e8b71ef1878e4fa6
font_02_sfnt_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1