Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f214a1e08d1aec…

MALICIOUS

PDF

80.5 KB Created: 2021-09-03 18:25:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 851514bdd7defa7e8c71d28cbad18b86 SHA-1: 33f74f6be0e36d16784728cbe1c7f51096679ddf SHA-256: e1f214a1e08d1aec5bef9571c1271848fcac7fc0a1bee1310ca60939995330c9
164 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://rireenfrance.com/images/upload/files/vobujubogene.pdf In PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/4909526305.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/64964175271.pdfIn PDF document text
    • http://chikatere.com/Upload/files/bonamuko.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/40197802028.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd1c0a23b1---xaluka.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/memabusiwivapuduxar.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083f7b062535---wuxudomotim.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/41634428783.pdfIn PDF document text
    • http://djpress.pl/Image/files/19866110253.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e766d7e7f1---zotofunepuvetivi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/kenetivemewasopaz.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/wivom.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/95445840788.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/93870925926.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c61ae715aa5f3e534bed471bdd652bcf/wugomodajixunibuxen.pdfIn PDF document text
    • http://schturman.ru/files/files/21010230965.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/99822034180.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/35q103299966poqt8h1inl6q63/18907968754.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/vebukivudob.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160becc3bb130e---womofolatukesel.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b3409ad4155---tatululumarulitetatob.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2b2fcdafb---10546268838.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/11893211754.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/bipamuxuderukodun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=engineering+graphics+with+autocad+pdf+free+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_off0000d2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C1 18252 bytes
SHA-256: 08aa3280944461e947733b4ced417cd32428ca34e84411b539c520aaf0f2ac10
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 11068 bytes
SHA-256: 7537d432c16d9f35eb6b5ad2a03f4af8298e5fafbab20fb735ace2302e7ec01a
font_02_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1