Malicious PDF — malware analysis report

Static analysis result for SHA-256 23774e193bb90276…

MALICIOUS

PDF

87.3 KB Created: 2021-09-16 17:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96968fef88412dc793a40443ea85f098 SHA-1: 6f5a96e6c701c1ff873230f9d8e11479e4fc6a42 SHA-256: 23774e193bb90276c8666a3e7f4703ef4a42d92fd627a196cf2d3230ec829e1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://daejonggyoyc.com/userfiles/file/20210915205008.pdf In PDF document text
    • http://zoldjogsi.hu/uploads/files/70520709015.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/pakuriruk.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/58477850095.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/98790193416.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/sifujerodemifikunozuzes.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m2a7no2tb9kv0uf3fmgitmgd20/87105630249.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/jerez.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/sosibagumefox.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/46819063110.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/70aceff610b0fe8a932e2bfd5851d7d0/49650778507.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a76bd829a---84569203770.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/82797451191.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pizimigukizisozule.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/tuxotisokusofiwutawo.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/55381872830.pdfIn PDF document text
    • http://pb-book.com/user_file/file/suluwidusemukitobilasa.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/1840017218.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/niramukudekivomubar.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/94037007301.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/54182101051.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee10738f8c---94872106871.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/99698564484.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/88213875346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=spider+man+far+from+home+123+moviePDF 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_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10936 bytes
SHA-256: 086baf529dfcf21c7ab059d40495041e8e7be617616a5bb34462539c9bd939d2
font_01_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 18692 bytes
SHA-256: 902b7ec8c1a09170eaa0d4cdbaa7d9a8e2efd1cbfb54f63616b1b8feb17dafd0
font_02_sfnt_off00013734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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