Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a262e754c67eb…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 13:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 358cc46b68d36a68f339dfc63ededce3 SHA-1: c48f4cfb105c1e95545d40c2284fa319e47ff477 SHA-256: dd8a262e754c67ebf3fe1046fc660e7d967844b38c52447bfa6a59df3633f36b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains. The embedded URLs suggest an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=minecraft+pocket+edition+1.13+1+free+download PDF link annotation
    • https://mptradingcompany.com/userfiles/file/waroxagoteguxuzopefisot.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/55790093831.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142514471586---27163499259.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/lafuvibivopagivu.pdfIn PDF document text
    • https://thaibamboorestaurant.ca/phpsites/bard_ford/uploads/file/kujipozibejugege.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/sixulej.pdfIn PDF document text
    • http://ahknchem.com/upload/files/42300254969.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/20374128667.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/65039204230.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/62383176047.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613459cc6b280---39964949058.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/75388497821.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/93475717389.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/nitobomatapibozukogilodi.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/50815762378.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/pukupa.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/texuwenag.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/tutojaresuvega.pdfIn PDF document text
    • https://led7.ru/file/88544875327.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/7010fa84096c8ab8c4f7f5a3c809f307/37859249804.pdfIn PDF document text
    • https://ibextrail.com/editor-images/serewagebizaxif.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/83948658345.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_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 10908 bytes
SHA-256: 798f379bdf78c4922a7c34a6ad4dd6e8ee6a9bc81481f192baec81beb649b47e
font_02_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 17300 bytes
SHA-256: 003f148fef318ed3bdbfe45bd51d753e58fb72c755837702b9706d062ddfb149