Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df54b101d1607a1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-23 01:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44887e169ea5d01394ae38c3c291d8cd SHA-1: 51250f9063c8f987381e07ec4cc8fec3b6665833 SHA-256: 8df54b101d1607a173a80f1fc9add7cef91e10725437685d90aaad57a5910d54
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs and the nature of the heuristics suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://laborke.ru/uplcv?utm_term=amazing+android+wallpaper PDF link annotation
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1dfca0da0---52672054797.pdfIn PDF document text
    • http://gist.adrianlechowicz.pl/userfiles/file/63416508402.pdfIn PDF document text
    • http://birdwatching.sk/media/file/gabevejokunenevijowakudir.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/67293692347.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/ninemanekifekaru.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/zujajigudarogiketu.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/59995718253.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/69722542403.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/dexor.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613834dad7652---palimidenaletikazuk.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/48176741286.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/xerolagerebapojebal.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/34963952660.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/vajunalisaxevibiwig.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16135b9a42f6e4---80358258739.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109180712523368.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/4c11b871c9eac346bd6789bb9bc7a4dd/14172199688.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137d38224c88---wudezesomep.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/46527659394.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/nisidoseripoduwusuzuko.pdfIn PDF document text
    • http://gardatrans.com/content/Files/jofasir.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/74466848241.pdfIn PDF document text
    • http://ipceurope.be/assets/file/77778407507.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/larobagesedez.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/dejobepovaxuzozu.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6003678273.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_off0000dc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10596 bytes
SHA-256: 296e34f6391e6888c6e98f55bdf041dbf153a2542bcf80b65b562b844426873b
font_02_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 17052 bytes
SHA-256: c8f328a2566a448ee94e55c5e2a9906607b42e895b9357d38fc4fe76629390a0

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