Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97eff673c434198…

MALICIOUS

PDF

102.8 KB Created: 2021-07-13 23:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ddd2f78e026ebab4cbe22a8ca09347e6 SHA-1: fc539eec55fe2b393f749a93a3ff1c1bee1d4708 SHA-256: b97eff673c434198dd31cbc485b22b3762b71d2bcc6c1921e27294878df5d66e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft plugins for file uploads. These URLs are likely part of a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160e031c7368f1---3594238996.pdf In PDF document text
    • https://iva-vietnam.com/userfiles/file/39038088902.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/18770ab53f1b9d5fd09105eb1cd82ae3/bitatude.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16095ee760004d---soritigaromufaxagoma.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8379617b0b---13695814868.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd55cde5a4---84465965782.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b03dafe9b43adbea81ae44ed66e9a916/91952920764.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/mosesixuvojizinajajabefe.pdfIn PDF document text
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/dogegamenexujis.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbe4c94db---35474881438.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/82550529129.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jemogixiju.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/24019071919.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/xafuduvugusoxomiro.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f4cd2682ec085aa89532453d45855da9/43558653991.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c873803a77---69533958713.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/28299890666.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/sogawizodolujaxazan.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/55001576535.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b01e17c6f---xusezinawafowi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/6illg4n3i1irkfl67n09sqhi27/nozugofodusovawir.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/xamikafuzomuz.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/vunarola.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4d1bd023b---lugesudadamafekisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=new+world+order+the+end+has+comePDF 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_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 10608 bytes
SHA-256: 43bec58d8706c4620fd5fe4e4306c62d320528fe828cc6f9cca3bd85df684212
font_01_sfnt_off0001489c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160AE 17424 bytes
SHA-256: 071e1ab8ab829de05bfd607454210345ddc4f9653c9c018bd8b0b87aa87f5f5e

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