Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3bae36b3cd9c25…

MALICIOUS

PDF

107.1 KB Created: 2021-07-21 13:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 98071dcf4c329ffc6edc3a947c74afba SHA-1: e6eeb9bf5c727042211f6a97e77cd94ab791dbec SHA-256: ba3bae36b3cd9c25d89e97c4048f83fc80a42b17732e110e02f7081211573d76
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting it is part of a phishing campaign to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple links to PDF files hosted on compromised CMS uploads points to a link farm strategy for distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160773f085543b---79322894375.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/8lq1b5jksacbsv2jghrtcr3giq/midusoxikukamodopibolipep.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/60e279e9c381b13f27b16a4d70847bf3/2996457265.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/150841034213.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/42171342956.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a43dd0ed---87477041411.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/v3epm3o7ji9ltrsko0pfk5tgn7/tafanarupulepab.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/6533120925.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089b300ed93c---44585932198.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/65801920344.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607f893e5f14b---43841671709.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105081244501601.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/14357564872.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/1516203111.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607678f2290ba---jidiwunamef.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/lo3501jmn8mo4c5r5fkbokfom6/84411083895.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/76119581018.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/barav.pdfIn PDF document text
    • http://geotersrl.it/file/rukejomusagoxini.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608124dbe20ff---supesopug.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t90g0pelmb5b07t6kl5mulocc9/rurotas.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/19b927fed45e5b99acf6e6c51b253c62/rurujuwewixazekuvimusokow.pdfIn PDF document text
    • https://tl-systems.hu/files/files/rikazokiza.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/widosisafuz.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210611194211_zz511i.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=nhdes+stormwater+manualPDF 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_off000141ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141AE 17272 bytes
SHA-256: 0ee75fb8c3b6d3702384cecfda65b014dc6cd4fd4ef45449659f313ab56ca280
font_01_sfnt_off00016f15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F15 10584 bytes
SHA-256: 72fa68ac5d9bcf4892d0a6a4e146d22a73530ad210bd898eb5691eb5bae2e8f8
font_02_sfnt_off00018725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1