Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b1baa5fe368a6…

MALICIOUS

PDF

76.7 KB Created: 2021-10-12 23:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c79bfd57a71922d17620c1e20e0b1dba SHA-1: f12cc94beba1902e8f0e9281bdd0e89cdcc78ff5 SHA-256: 1d1b1baa5fe368a6c13954e9452e82657f6282ab16ce772293388e34e0a437c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggest an intent to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jurad.eu/files/file/27380589236.pdf In PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/39490900608.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/2369831042.pdfIn PDF document text
    • http://www.ezmoving.com/file/65943469638.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca4786e8ce---pekosiridevozibefata.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/wozazere.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/54542263803.pdfIn PDF document text
    • http://eskuvotoszkanaban.hu/editor_up/gixirumurogivujo.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/boxatiwokepijolunopuradol.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/96975027515.pdfIn PDF document text
    • http://www.bash.cl/media/file/58480901258.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/63244139796.pdfIn PDF document text
    • http://wwsm-us.com/files/file/98578953756.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/kumovitazuf.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150af8cb10e5---89622989820.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/f864bc559f74d812a461434efa05a2f9/zakenudipelogiz.pdfIn PDF document text
    • https://edgecs.com/documents/14949526709.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/46758983272.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/67067403332.pdfIn PDF document text
    • http://aqgwegfjdlk.handyfriendship.com/upload/files/13597530375.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/jorezekugopimejudajijog.pdfIn PDF document text
    • http://oris-am.com/editor_up/kedipafunozarutedugik.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/31815077258.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/185c66352a778ee473273bc77e87bb62/48684366737.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/xPAns0MRe5M/uplcv?utm_term=bus+system+for+8+registersPDF 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_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 16616 bytes
SHA-256: ddd9073b0e538873549c180a2e03018f147329e1982061aa913a09e4b3a73332
font_01_sfnt_off0000f42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 10720 bytes
SHA-256: 4965330893fca2f3cbe40a246a72e26ac2b4f4911e53c1d1fb42c114b8461506
font_02_sfnt_off00010cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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