Malicious PDF — malware analysis report

Static analysis result for SHA-256 f425a4cc14b1549e…

MALICIOUS

PDF

75.3 KB Created: 2021-08-27 23:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ff32e685bed973999afd7a0125858214 SHA-1: f976da02a00efbec369a4d7351c0465558172bfc SHA-256: f425a4cc14b1549ed569bf591973d5de8bbc9e8fdeafee948a0ebfdf63146419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the content as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=sonu+nigam+and+shreya+ghoshal+mp3+songs+free+download PDF link annotation
    • https://alshamiltrading.com/alshamilfiles/file/23888643378.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/53286170799.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807d9a56a4e---12900313858.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ab5d71026---35947423542.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/75302810728.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/62625701815.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af2386a5f---46963073455.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/68499444194.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/dikowasaxuvekowenima.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/fe52b1ccde250cfafea17e04789d4ee1/72326562283.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///wibuwuju.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/nedulejamemi.pdfIn PDF document text
    • http://howsonfamilyreunion.com/clients/5/57/57b8fe7d350e782a16e6afc8bdcd6467/File/55065340610.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/34719630720.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/bevenifa.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c70713fce---46425600261.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160858b0551bbd---wesisuvuwegaze.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/325394b2fdc053d4c8a41e92f7d4c40d/rinefageruxixarafuxapa.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/uc0pciokoghmtskfqb1o52hgc0/47082200756.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2l5fa1pvv2f6tv9lshbfm4nhu0/11019581432.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/votafota.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/revevitat.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/58645474095.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbe24396a26---76643985163.pdfIn PDF document text
    • https://begili.com/uploads/image/files/jakotateginuvotajazobo.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_off0000c094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC094 16584 bytes
SHA-256: 0c5ef25d34f22aaede0cc9181ac6cbeb20225b24a85cd66f08aa8aa44a3b2123
font_01_sfnt_off0000eb9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 11392 bytes
SHA-256: 2cedc2e27494c795a9b4115cfaa63a9a3b8671de5552e272dbfd54190591c4d6

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