Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fc58ef5577aaf61…

MALICIOUS

PDF

85.6 KB Created: 2021-08-08 09:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ea50c937e98d7112679ff7fcd8f38a0f SHA-1: f1f120fc47f92a2fc2537109b04f33485386f459 SHA-256: 2fc58ef5577aaf615bcc936d5b3c8d67f59de8655e2233c77976021cbd62d7b3
164 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The presence of a 'download button' heuristic further suggests a lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e678cebf8ae---79650584428.pdf In PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/2650634117.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607851cc1b0a2---48476860719.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b17da18f94---41753674814.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/d40f0befe9fdc20dae7886ce0eb20792/xogisitimevibujavop.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/r6gbeppu7k4mvhgcf8ph28vu94/tojodetoziriliw.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/afecc96471a438a3c18060bb13ba8cf7/nofugifore.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b765ac69f---vejiruxi.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/92090145510.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1d3bf7a2cff4fb791067aed39baf22f9/pejebivikawibafo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7024b74d---37747083107.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ts6cgstqoacgo2195h4ojpu512/figelumadoz.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/72618256cf18173f1d04e445bf4597b8/61321316465.pdfIn PDF document text
    • https://estoniapools.com/contents//files/92214460496.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ad03a809f---41326149600.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/3f17ad0c4e270ed941500974d79ba7e5/99804854246.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f85baac47c25a938e8d32be30ed375ce/79336192913.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/51125322418.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/e49c13bf2bbe1916284121a2838be2d0/kiwajisozibobibamuwowu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/22932653001.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/siwametuxefenit.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/xenegoxovudafegozofuvuto.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/7c5f6648e94a20de699410786909bf2e/76527592786.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0602b87abc---debuke.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/59855730031.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f043eaef0f---nulunozuxojupikebawajuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=debtors+balance+confirmation+letter+format+in+wordPDF 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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 10864 bytes
SHA-256: d0d61d925545f86eff14aa109ea2c4e46eaa3a183fec3f73887b5aa8f1823222
font_02_sfnt_off000119dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DC 16896 bytes
SHA-256: 48ed0581e4bec60b209d6d859aedc181b5f73f56eb9828010f411e4bc4a24fff

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