Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6b966fe0bfda1c…

MALICIOUS

PDF

110.1 KB Created: 2021-08-11 10:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 422780a4d485fb5b94de07b593a67ce2 SHA-1: d3856b4ab3d8cd91fb276957cd959d013dd1a107 SHA-256: 0b6b966fe0bfda1c1cdc1f4845a56ba11bb54896854b01bd6eaafd046000e79d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is used to host and distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://crysiq.ru/uplcv?utm_term=bissell+proheat+2x+revolution+user+guide PDF link annotation
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/5be88l04hen2minmhs1n2qegeh/65640007626.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/tonibupolurudozelujisuki.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63557d1487---89147290131.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d622db31---3859866224.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70beba5aa9---82476787576.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624406479.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/16890893166.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/mafupovapalexupad.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/70444894818.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/pasapegiruzikujak.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd9a5f3ee8---28884714893.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/bef50fed357e23a9718f75386e0dc969/tawoloduzakunilebif.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/porixojejiz.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/14652190760f7d3c982b2d.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/42446021556.pdfIn PDF document text
    • http://www.seja.lv/assets/ckfinder/core/connector/php/uploads/files/zuberisakapiduxafu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e57909ca---xovosukajaxidegunukisaf.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210616_734EEC9ECDF977A9.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/pjtbnglq9gqsvdum1ag1s7mcoj/tupodu.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/0ec76b986e037e7087314321e90358dd/49145451326.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/86498472711.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210602173538.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_off0001473c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473C 11112 bytes
SHA-256: b83417ae410f206392e03094ef7ecac450754528eb1949d3f94d75a7b49a6e6b
font_01_sfnt_off000160f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F9 18600 bytes
SHA-256: e98b79d817bb2f9bf8c27ce29940cd38b9c7090af4cc47681386aa084e0de9f8
font_02_sfnt_off00019202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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