Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fcc83771149aec…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 08:58:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d8b539855b5c0fdedb1a17153e143793 SHA-1: c079b947c8394fa1d96d16a4b635064bf5275352 SHA-256: 74fcc83771149aec2ea4662a5068946698b957e77209bce53eacaad9100062b4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=famoid+get+free+likes PDF link annotation
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/80932688473.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/kipefejinebenuzijituli.pdfIn PDF document text
    • http://myredm.ru/uploads/file/298585211.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/34735434572.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/fexowisajafajoto.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/magurubewarutikerizinobod.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/pamumawudixivef.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/71270270488.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/wakitoviruvanatodiguk.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/ulq6s0mgpge7d3lchlvncop360/5701909136.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613389596741b---73515891903.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/vakin.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/94287256477.pdfIn PDF document text
    • https://kawanmto.net/contents/files/kovimakezoxumifizuzofa.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330f9dc1ba5---67867698739.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/079f9a85a29ffc4c4ce546a4b764f5d0/lanimaronerexi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137bf83757e7---bugososozujufomafitapewo.pdfIn PDF document text
    • http://budropol.de/Upload/file/xukaselezofesenozebaroved.pdfIn PDF document text
    • http://dytac.hk/userfiles/92187221367.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/lidonebojojubomojasaj.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/2544903761.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kemorebusovenadutu.pdfIn PDF document text
    • https://shunnasato.com/99302999248.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_off0000ca18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA18 16868 bytes
SHA-256: 8b453571d279323df32477eeae77d60f162adc7ad36c6c5cb7b4302d3fab694d
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 10664 bytes
SHA-256: d69839d8171091b1955bccc3157983735a962b49a93548ca436c27e4d1fd5e9b

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