Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bf97b938cb82575…

MALICIOUS

PDF

89.0 KB Created: 2021-08-24 13:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 444e94ede6579afefb3ecc02adb32e23 SHA-1: 872de6ca7424afd8df22d8b20a7ee1bc9abdb161 SHA-256: 5bf97b938cb82575cf29246fd78dd57622a376f38b568f36a2934c8e3e399e8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, many of which host PDF files within WordPress upload directories. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16123a959d0727---momigilovujidoz.pdf In PDF document text
    • https://sjalikave.hu/pictures/file/tewenamabe.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/wupejorotibefozutiwutam.pdfIn PDF document text
    • http://charivne.info/images/file/53649371931.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2a02da482---vamigifekuwamijufatuvej.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff9b09896---70432925341.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c328f44f226---zavojawugomodopa.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/14231010164.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/f0ceed47f8654d0257887d7dab0fbddd/fegabekosela.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/gevunesirasaduxenop.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/98482772352.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/pazinozuwebebufa.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/56803277703.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc18044859---57813813564.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/5528668458.pdfIn PDF document text
    • http://kalikraft.com/images/file/nazelek.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160886b30f00b2---tepapedilafagilojowudifo.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/arodfaap64efvi6f8v7ugjmfnr/15319519856.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b46ce3a6e---fubivub.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/98283118326.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/35548835468.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a1ff0af0e---75435451434.pdfIn PDF document text
    • http://aimic.com/userfiles/file/85602955144.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/7727831086.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/65162202904.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=red+hands+with+white+spotsPDF 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_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 17476 bytes
SHA-256: 9153a0d1e904ddd9b5b697af81b4a6d13255c7d1724468374a0d3fca16d2787e
font_01_sfnt_off000124b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B4 10476 bytes
SHA-256: e9dd00a1cde0814ec52e415db29f407c5148465cb8576a81bfe78f192f9fd943
font_02_sfnt_off00013c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1