Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc2a645a267ed5d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 12:00:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32f36fcdd14be103f267af48faa4f127 SHA-1: 1bf65eca539c7fc41c777b3eb39930069bd348f0 SHA-256: fdc2a645a267ed5d25021e7d626cd3314e18df86deed06a03c5c1e9b574c0740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or are part of a link farm designed to redirect users. The presence of a 'download button' heuristic further suggests a lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=can+playstore+be+downloaded+in+laptop PDF link annotation
    • http://deurenhanger.nl/userfiles/file/rixewalusasopujilena.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/berefixukonib.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210911_1F192751FD994242.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/fatunej.pdfIn PDF document text
    • http://ciskmv.com/css/file/45555980688.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/jagopefuvova.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/61566219613.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329b95be513---28883564649.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/samazavosu.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/vinobi.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/90957333347.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/bojerojulubelologevuzapi.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/31481160496.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/mafedipupuwotexujolu.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161419f6f245d7---3265473519.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16143eb66982f2---gonexo.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/silorefetutatipodebetup.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/fokopuxitix.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1614022c2d65eb---vigiberubagidepawivisi.pdfIn PDF document text
    • http://klenderbio.com/upload/files/3269373175.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/tujujuf.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/bepomomavi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013662.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13662 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off0000cec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC0 21212 bytes
SHA-256: fcc9d6d1cb5d0fa67e5b758eec5f28456e992d79c63d5bff4560544dbf94a1ac
font_01_sfnt_off0001058e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 10756 bytes
SHA-256: 397905d2c9e11b6e710bde297823b09039d8c136e50c9d12a5d8960ea6a17243

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