Malicious PDF — malware analysis report

Static analysis result for SHA-256 f39f1af5cbbc7d89…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 07:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 711ca7e331c7739edf36f6a8bf66f8e8 SHA-1: 71516c16d76d7b41202eb99e823ef216a4404e20 SHA-256: f39f1af5cbbc7d89be4daa8df3307b11be8e6dc415fb375879de327806921a49
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://podiummoda.ru/userfiles/file/541778860.pdf In PDF document text
    • http://sung1.com/upload/files/95492665497.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/59f1888f93ce70dd8dc1f8caf42837e9/sanixidinizukazu.pdfIn PDF document text
    • http://jfhcoaching.com/userfiles/files/tobesat.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mimejelisipazijuvegix.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/wediputomifo.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/lalixora.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/mulof.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/judebufinujopaxavizi.pdfIn PDF document text
    • http://abnicum.ru/files/file/mezanekamajivosaxit.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/838211681.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/25644596878.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wekakapel.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/rotokadesefowix.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc38c6e9c0---mamuwenatalozegazone.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/21574677553.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/13789230896.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/gazozobusosevelobili.pdfIn PDF document text
    • https://yellowstonewildlife.com/resaxudowupasas.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebcb5da9be---fosotarikenu.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/43803508182.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/91771480865.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/88131438485.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/zezosovatelilatazu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+b+redeem+codePDF 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_off0000d92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92A 10180 bytes
SHA-256: f4ddbe7b2fc70f3c6c09e4ba501cc47644b771802a19e3c718c0fc9b9a2f72f3
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 18048 bytes
SHA-256: 35eacbee9ea957e08b658df063975bb2954fcb6cb77688905f1647266b1a569d

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