Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efcf78e19f22848…

MALICIOUS

PDF

77.6 KB Created: 2021-08-20 21:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8dba682f7284734c6c2a587370e55927 SHA-1: 361f0f662040065c3e278bc29d6ac317994cadb4 SHA-256: 4efcf78e19f22848d77bad5fa106dad0990e7a0200442ccece19cd7b8e1b24a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=zoo+phonics+alphabet+song+lyrics PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eec28cff68---11078201845.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088893def9ed---17990791794.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/2485422516.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d0450c72---45011600881.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f7cba511a2c0408dd0fe9aa4022528ea/gaxedutukupifa.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/76248069188.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/wibetokefumudinunan.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/58769994081.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160adb93aaaca6---57085283770.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/e6pv219isf4gbou1g7b6hpof2r/kazivulusalaje.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2i6tnbba2jijnf0ba200oh84s6/zejasuvapaviruzunaxota.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/89621732224.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/jobaduwalowununebifil.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/be993c30743b62aa760d61eea10523a7/xaxexanexaman.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/v4i4pq6t9qa2ejfbvn30ij4if2/difim.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f68up4flb4n0sl8cvhjs4h89o2/tebavixilefopigosavekigax.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/gosomodixanilajizi.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/padugoradux.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2f4fcd246c3f732f4dff71a3df88f0e5/68701789625.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/xotobosaroxizexozumosa.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1077c867---zuruzir.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/37214899123.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_off0000c934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE146 17684 bytes
SHA-256: e12b38359730b014e1446c6fbc827c2cb0d10497d0fc9209d651322c22be9b7c
font_02_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 10872 bytes
SHA-256: f3efb45a0ea4b3795028f6c4116c955e8e419a1f9dc58d87efd782e745fca0a0

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