Malicious PDF — malware analysis report

Static analysis result for SHA-256 231e72d3d3b3779e…

MALICIOUS

PDF

95.7 KB Created: 2021-09-01 22:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10e4ffd12d61e5aa2f1d15835305dafd SHA-1: d6956cca3151d8a87b2577cb5c7ddd0e34de05ee SHA-256: 231e72d3d3b3779e88af053e3d1a27d44f449ab480cf5df442f29a4818c1deda
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the links are intended for SEO manipulation or to host malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb337198ff---piweduvobawusegewu.pdf In PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/56819985763.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/zubevurinexo.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/40a2b7273970f7ceaa63548fdef636d5/geziweguxiresojetivupo.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/lelowis.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079588eca4c6---13316030445.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nonekuvajutor.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/winezinukogaveg.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/92958863706.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/luzivobuzotusotig.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/fojojowidusewipew.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99daa7a3a08278438d0ef29352c1b3d7/judufovijovumoguvadapi.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/kufefasoxelepo.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/tiwujevok.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/93ffd7a85c765f2ceb7b056182cae0b8/nasefezimiwimapikotaw.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/majomadutalerivunajop.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/masiwaroseminifosop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e034f08ff4---28627724598.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/49261973991.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/62085013648.pdfIn PDF document text
    • http://becucci.it/userfiles/files/namomigenezor.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/47182870745.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/mafav.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16273774805011.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a01ccbaab4---gururiv.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16079964e2f655---pavixotasarowotopojes.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/8279694760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=evermotion+archmodels+vol+131+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_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 11156 bytes
SHA-256: 81c1d50b3b21727a3422c4dad0952d46139623716f73d53a098d8e757561b094
font_01_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 19016 bytes
SHA-256: 6964592d71a2549934339e2a99ec3ffab8072f34b514898a258f6e5397be0767
font_02_sfnt_off00015831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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