Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b03dfc21f298bb1…

MALICIOUS

PDF

88.2 KB Created: 2021-09-19 05:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 52da253261695cfa6712133c0b48a147 SHA-1: 367913fa9629a8a842731de8a3ac914bb2032769 SHA-256: 3b03dfc21f298bb1b453f2985526fb201c7f3237fe7b7fc911e935213d6f6092
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the heuristic findings suggest the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://konakelektrik.com/userfiles/file/tebotivigoxejigajisegas.pdf In PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/98337603848.pdfIn PDF document text
    • https://fasleh.net/Files/files/bezebu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xikuvuvimefaluf.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161343c94cdffe---pujekamupelufiluxik.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210904142017.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/299ab96694461ccf9d26dc5b40fd5f14/lefunusos.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161432245762be---javafa.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/25305345239.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/39956415487.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/16787220780.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/67385037166.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75408f545---76040859005.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/21886718686.pdfIn PDF document text
    • https://olterus.net/contents/files/11561157036.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/bidaf.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/46009494528.pdfIn PDF document text
    • http://rrarental.org/upload/file/fazosasalirap.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/56177124886.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/85360324112.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/karude.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/boteleranun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=dizziness+and+vertigoPDF 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_off0000f403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF403 18416 bytes
SHA-256: 77b0c7b6e18640ff5c1220c95fddfe0e152959f09f1dbb3667b46c96bde8a972
font_01_sfnt_off000123ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CE 10504 bytes
SHA-256: 59d3d3241a70ff2f56bb794d25f965543fcd4623a356ad8d25a1cc168a383320
font_02_sfnt_off00013bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1