Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c818d15fe56de6…

MALICIOUS

PDF

86.7 KB Created: 2021-09-18 20:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17fe0d04c8e037aeb0ca3d31e77862a7 SHA-1: 36a265f7e0f1fe463f6d8d4c6a8d371f793550fa SHA-256: 29c818d15fe56de6f664d893a3968dfe35796f87ef73a223a38a8dae9d0ac9d3
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV detection as 'Pdf.Phishing.Trojan', and an ML classifier. It contains a link farm with numerous external URLs, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The presence of a visual download button further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=splithit+premium+apk+download PDF link annotation
    • https://himalayanwanderer.com/himalayan/userfiles/files/88367520780.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/45694892670.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/03fdb4b93d00ab0c8752c9159b53e907/35454779316.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/borogevafu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f9494aa6ac86dd618ca110365868a80c/sadevebotamu.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/mazatiluwipijimizasejo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e5fe21a44---44228043935.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b9319b95---kekapolurifosabeponebupe.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/5778694260.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/majuputubexunuvupi.pdfIn PDF document text
    • http://e-menu.hu/editor_up/91723272798.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/joxadorafumun.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/79758029283.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/gutuj.pdfIn PDF document text
    • http://eko-gospodarstwo.eu/files/file/moliwatogivepeluzoxa.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/86983825747.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/wubibupinuvepazerux.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/37658863293.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/78617718117.pdfIn PDF document text
    • https://luminex.pl/upload/file/fewutojavisutabew.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390558e73ee---fosaxuniwikubidoxejisim.pdfIn PDF document text
    • http://ubest.ru/images/file/zakomidemokavosuzidadobe.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/pabofawixonemasuw.pdfIn PDF document text
    • http://esejsc.com/upload/files/10542773713.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/41792949692.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/9888246078.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/1634436658.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_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10844 bytes
SHA-256: 9fff9c76a5918a137f1831b9769d328c00c37edb2b39947cce7c73f222a82a41
font_01_sfnt_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 19152 bytes
SHA-256: 7b71469cadb548ecc9ee7b686ca3508310f0f1668d8fe3b40f57a2d5e74dc323
font_02_sfnt_off000134f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1