Malicious PDF — malware analysis report

Static analysis result for SHA-256 1107e5e8611b3507…

MALICIOUS

PDF

81.3 KB Created: 2021-07-31 22:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fa30f460f10ff08284f4bc35268ca55 SHA-1: 97f75b05888c92dade11e07e804ca644fa059584 SHA-256: 1107e5e8611b35074939ff6f2669a8ef635ac10e8d2a1fb1b9de27826447aac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to PDF files hosted on various domains, including compromised WordPress sites. The presence of a link farm and the use of UTM parameters suggest a phishing or social engineering attempt to direct users to potentially malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=download+delphi+7+full+version+free PDF link annotation
    • https://nnt52.ru/userfiles/file/bagetisusu.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/xitizazuroxikibuxafi.pdfIn PDF document text
    • http://abnicum.com/files/file/98101205712.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acdd606e12---90091367242.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3972ea43---53113966305.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/8e5436st848ve39lso5qge0m0g/fedawewe.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914a5d847---80928023045.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/21646268598.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/nalanuzaxokuxuzomef.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/53480020442.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c558fda3157---30853493063.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cf69beae1daf3596f4352a1860ddd8cd/melegopawiji.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/gisewuzunekuxawibiku.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/f5ofi7k77tqfosq2dv50jqibfq/rekororovewivekel.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/xutuzavum.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/17973366358.pdfIn PDF document text
    • https://isleo.com/i_photos/file/42298904732.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/30174527393.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/4969051508.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/48949476067.pdfIn PDF document text
    • http://artospace.com/pics/file/wetubelidulixobogosabi.pdfIn PDF document text
    • https://signika.pl/Upload/file/jujoju.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/81023912045.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608a03eef305d---genuwubojowe.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/zatonenutugebuwogiw.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jedigo.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_off0000d753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD753 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6A 10800 bytes
SHA-256: 5e0025d9025e56a30e7d232a98dd5944d9c34950b65cb336a19576d0efcb3921
font_02_sfnt_off00010841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10841 18288 bytes
SHA-256: f3b9f4dca4754814fb771f7557700dfd1872987888d1d254d14efee12b9b9c14