Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d114b1316161cd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 15:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ced9bc8eabb8f369833846e57fff9acc SHA-1: ead78e5c3d0c8dbed320b18d0bc21e7c05c2232e SHA-256: 83d114b1316161cd7a5863ca484296b7a4394cbc03bb11a78ae176ed2dada3da
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. These links form a link farm, likely intended to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sbmhavacilik.com/userfiles/file/8668967050.pdf In PDF document text
    • https://thefertilizerequipment.com/d/files/lifatotanuziledorofutamoj.pdfIn PDF document text
    • http://tfforming.ru/d/files/48718785634.pdfIn PDF document text
    • https://ceiling.holcom.vn/webroot/img/files/9679752341.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/mefup.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/thrrv7321rnis7jrjmrv3j0ci3/27389944671.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_185942.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/72082550550.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/42615124229.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/99079659299.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/76624898158.pdfIn PDF document text
    • https://recrut.com/files/files/25948115221.pdfIn PDF document text
    • http://imbirimbir.ru/files/9241894678.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/xupaketixixonaxafepekujid.pdfIn PDF document text
    • https://felicityokolo.com/file/jusekipemogaxiganaxofiked.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613da81b34e3a---kixoko.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/hrnn019f616a44fokq2p08v48e/92639949077.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/wadujobitaxabesubip.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/14925136196.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/27276538326.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/suxiwi.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/nuxapamukewodavi.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/3355433213.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/mawuruvisotoxuradobujot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ps+2019+app+downloadPDF 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_off0000e1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 17672 bytes
SHA-256: 739a5afea5be507bbd23c2456a06379a1752d210ce0ef6e3bdba63bed08cb65e
font_02_sfnt_off00012799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12799 10512 bytes
SHA-256: 4134dca8902f3e55e1dbd07783741d0e2836cb60b1066101a42d2aad18c61536