Malicious PDF — malware analysis report

Static analysis result for SHA-256 31842bf6ced0f595…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 18:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a060033be2c49d6bdb4676b0ad000468 SHA-1: e168ab7a2c3d4722f8aa0eff0073afd4d45fc1b3 SHA-256: 31842bf6ced0f595c161e5e0e37e416926e588c4592b3fd1bafe056cabf7f4c9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external PDF files hosted on compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure itself is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792bef4ac89---tugipemowuseparaxelin.pdf In PDF document text
    • https://kocarbonag.com/luutru/files/zekejujakifiri.pdfIn PDF document text
    • http://iccarrentals.com/files/file/golonamukixudegop.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/japavulukuge.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e9ba1b0df25cd68b0cc7d6f43f9148bc/debomabeforenopumol.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/86886256510.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609024e1f311c---bugarexaw.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec20909dcd---bagunikowugalitosatu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f10819c5---54311522476.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/jokewopowiwufes.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/91166502281.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217266ed220---98825346966.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/tituzijofutalimotijujavij.pdfIn PDF document text
    • http://stavbyhes.cz/ckfinder/userfiles/files/rejuluwomozomoloporu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f10a48bf8df---58067552690.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/65291896812.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/46848389084.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/siwiviwigude.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d540ba960c---86933176612.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/98964084565.pdfIn PDF document text
    • http://hibertek.com/image/files/20210702_024915.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/13bca2b9fd06e3e254d611dc7fbcd0b0/pematiposumatajulaxanox.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/12362163296.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/d0fa80ade79af835c58749565b48e06d/puragewopabuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=phosphoryl+group+transfer+pdfPDF 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_off0000d97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97D 10900 bytes
SHA-256: 7fcc4d01175a9e4ff746250534cdb0e5d71ae7b2658b9e777d3c1c57ae5f7269
font_01_sfnt_off0000f292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA4 18568 bytes
SHA-256: 9da95b0acc6d7b4c2a7276b5d8b92bcb20a095a661bb38bde453c31ee6c4d70c

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