Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60735a578111768…

MALICIOUS

PDF

73.2 KB Created: 2021-08-07 03:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 067d5e33cb248bf4efa613b34468be42 SHA-1: 918061137383516637c294fa713b7e52f2637f5f SHA-256: d60735a578111768efaa299f37e46072d2dd1ef06d95c40bf029f1d6ff9dbde8
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is unreadable, but the heuristic findings and URL analysis are sufficient to determine its malicious nature as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://theettiaresmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/gonovusawawadasif.pdf In PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/12d6f5e2d4284e922f2a649ef4714a57/kijuravutatatokusez.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rbvp4budg28ebh8bk9k9dhsu4g/68150354944.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab9b362e0dabc55c7b9f97ae916b4f88/talupoluwopigafapuwur.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/71599229027.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160757c3e3169c---vamesiwadonalof.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210704024243184.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091649d33482---tedatidepakuma.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/divugod.pdfIn PDF document text
    • https://morabia.fi/images/file/23722559096.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/pevikibosumo.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/paxebopupolegixad.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a765789df---47200446992.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wigozam.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/929e4e54b359d7cd4d0c61d13ac3ee17/61315211954.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/80254499195.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a5f63803---jajejimubem.pdfIn PDF document text
    • http://epsilonsigorta.com/files/54010104740.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/40715939693.pdfIn PDF document text
    • https://room12shio4.com/contents//files/pizabukuwasemomemubonuk.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3fd90633a61872e38bac26c7ec3b73dd/34354625971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+de+ecg+basico+pdf+espa%C3%B1ol+descargarPDF 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_off0000bb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB89 15840 bytes
SHA-256: 5eb11ccadaaf20c9ac3b5ca7f4b8842ae5f50d5d8e491dc990b352b1b5379aa5
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 11136 bytes
SHA-256: 998a0d0bd07b0d67e96b36419baa635a1e6e1346bf0634b77534ad1d37e9a7e6

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