Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47d6dadbad6db1a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 09:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d761bdd3f7d4498e0b1e5945108109c SHA-1: a5149080fbd9c7d02831061b11dfc37f33800c7a SHA-256: d47d6dadbad6db1a1739079f7d35d2489b7027e6ee470f440c141394da50794c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to distribute further malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crysiq.ru/uplcv?utm_term=ghd+app+cricket+live
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/331iccscl5627a2ighn44v631r/zijexelefezuwedidutixi.pdf
    • http://www.psoealora.es/ckfinder/userfiles/files/69564159749.pdf
    • https://meesens.be/KrMee/Tekstverwerker/51864751369.pdf
    • http://climtech.com/files/files/reloruveforijovujuz.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161427a3690a43---55390042934.pdf
    • https://rwd.webseo.tw/upload/files/85373020771.pdf
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdf
    • http://noxsun.com/jingkelun/userfiles/files/20210907174746.pdf
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/22719158105.pdf
    • http://signauction.net/userfiles/file/77866701767.pdf
    • http://idroter.org/userfiles/files/1090155725.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ssu0jb6jchuh3eskecadgmgpev/pudujufiwiponanasalizasan.pdf
    • http://resetimpianti.it/reset/public/file/fapijufewakaguwisesonen.pdf
    • https://tatvan.in/userfiles/file/91523031377.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/59369285995.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/db7aaf3e93b63588459f90353552762f/gukiloxuxivubuwabumofigo.pdf
    • http://americasbestmanassas.com/uploads/files/78520381391.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/pobipalemejuwasu.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc6450063---robujawezi.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408e17b4553---luxitag.pdf
    • https://www.anoregmt.org.br/ckeditor/ckfinder/userfiles/files/pibejitolula.pdf
    • https://o2opr.co/userfiles/files/18459445059.pdf
    • https://karolinanowak.com/userfiles/file/tunuwugutedavidokeju.pdf
    • http://turnwealthy.com/ckfinder/userfiles/files/1924513090.pdf
    • http://sibinetweek.ru/userfiles/file/80164148779.pdf
    • https://sporyolu.com/resimler/files/34332299771.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50e.bin
c73076d73dd2a4990f6e7f5d46b814f1b0daf8290af03c999811b7676a90f551
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50E 10416 bytes
font_01_sfnt_off0000fccd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 16792 bytes
font_02_sfnt_off000114df.bin
b09ce48e2fb0c32ee4b64e09fd4a4fa2bd748d2e113368ad1676a33c50b850ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 17320 bytes