Malicious PDF — malware analysis report

Static analysis result for SHA-256 c589d6343236d7c2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 20:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96e5c81429125e56fdce3ee8a4dd93b2 SHA-1: 6e51824a88e583487f67296313019ccbab016dc0 SHA-256: c589d6343236d7c2b58020614020c59ae9e1979d6e9c7d616fd5bdf26bd39465
164 Risk Score

Malware Insights

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

The file was detected as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of a visual download button further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://samsungdvm.net/upload/ckfinder/files/38689195874.pdf In PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/xekituxeweravenomolabodu.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/56605527805.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/30382237609.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/47173910594.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/vuzusedafunegi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/povab.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/18569773809.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc1c5dac6---32358885986.pdfIn PDF document text
    • http://labsshop.com/d/files/zazab.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6ef09c6b3---valune.pdfIn PDF document text
    • http://beril.cz/userfiles/file/59062421356.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/92058839627.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/xitifepoxupup.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/nasanuvaxivugoriwimomis.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/74300331476.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/1947814221.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377d4954bd9---91659761354.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/55rbioopi417r64la527rfifd0/pebenisojemutapug.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wegejaxowegat.pdfIn PDF document text
    • http://www.puhito.hu/uploads/14153791977.pdfIn PDF document text
    • http://fruitvita.com/files/files/49631313845.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nalusado.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/setenorimogukosepol.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/09fc701d9f929711f28511483959e931/97459331798.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+red+johto+adventure+gba+downloadPDF 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_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 17788 bytes
SHA-256: 7ffb12cf4b2e192f744eaaf79ab80f4550dbb984f6e187d110f8ec346096eadb
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 11052 bytes
SHA-256: 77f5d2a17bdb0b83cdc16aa9e11b3b0676b31633e72177943be32b73bafd2100
font_02_sfnt_off0001189b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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