Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a93f2840a1e607…

MALICIOUS

PDF

71.7 KB Created: 2021-09-03 08:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 44de0ebbdede2697c0ac2082fe91a2ed SHA-1: 35cab152c16e372fb321a79f220336e23dd27a7f SHA-256: 84a93f2840a1e60752e63661ca51f893005b89d77319cd1f3016083ef6efba39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious websites, possibly for phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=harvard+food+pyramid+pdf PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ce515429143010fa865583625a6108fa/17113575307.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c8b4bb43---jepufugevekenurigonirajat.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/vigizusazob.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/dd7f2acbdaa40b38362dba73f702a100/vamigetawas.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52f8e73f0---walawamitupexixirixujegos.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/45333517893.pdfIn PDF document text
    • http://thepducphat.com/upload/files/12364446770.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d2628dfe---3901285369.pdfIn PDF document text
    • http://gz-gm.com/uploadfile/files/20210817_175551.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3741e1ff78563055509a7cb1a3e950f3/nidad.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///xugivokiladewum.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637a017551---vifedoto.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b53646a8c09f2d844ea3b207773c1816/ximivubemilumopotu.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/75844968599.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/043a6fe27b531dd5f103581a9e1c9793/49470383046.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///zukukanakuwujowegesov.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/munezililemu.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/dexonuganuzelesagewikovu.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/88021371916.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5d6fbd560---66844903670.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/wazelago.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/vobafafazakilokigoledum.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/lefowelilelarakuvadevota.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/tebesepojuwot.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/9637284670.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_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 15912 bytes
SHA-256: c1a90537c62953cf1857aaa744bf245381b9ba1a6d5f1b059408d119794a7097
font_01_sfnt_off0000e204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10280 bytes
SHA-256: 7c4b87f4b27d227c4b640c4e9970cd9d8efb8438e86dbbc5f2ea81fe0fb165bb