Malicious PDF — malware analysis report

Static analysis result for SHA-256 805800dc797ce712…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 20:17:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a1cbfd84690fb234b8d4ee32205044a SHA-1: a4fe91b964273d4409cc6ba909008627166b57ce SHA-256: 805800dc797ce71271928f02e574cbc0ca205a2be4c779fd185b0ee18a1bfe7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=fired+up+online+free PDF link annotation
    • https://laser123.com/geektic/files/rosat.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/jetonup.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d1a121e2dea70bd6aa0a845c052a9b8f/6334995641.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/78320923045.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/pejurotaxizazux.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/66287844088.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/39750810058.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/90646171355.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/newigitilalamimonigiz.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/6efadcbb5c9c56e7954132958c2f1d5a/titejaf.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/xoroba.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/monemixavo.pdfIn PDF document text
    • http://www.gobarging.com/uploads/textareas/file/nofaxizimumu.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caa794e665---46881881121.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/23933512076.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/lavisizalave.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/womuxowisegota.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/lotenupelonalupika.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/sovoliwegepuded.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/65018598683.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/60818225897.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/muvuni.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/82452788443.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/zupinujaligig.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614528ff27495---53233129157.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 17212 bytes
SHA-256: a968e26726ef8c32d26ae749ee36faab7282b8aab5d423b81746aa08d21993f4
font_01_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10140 bytes
SHA-256: 005b4b5c97bee85066862a5d56d8b539dc379e4c7167aa6a984e4dd0b2ba2fa1
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1