Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab697e334bf1c9c1…

MALICIOUS

PDF

82.2 KB Created: 2021-10-11 03:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5f9aabc41d4f6d90a9b4ed88f56ad406 SHA-1: 31c7a39f04d5b3a7126b0531771a0b0d2c297e8d SHA-256: ab697e334bf1c9c1d5348d3ca11f18ded648b5d4c7fe5d96357810dd99eff69e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Multiple heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on compromised or disposable domains. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=tamale+to+accra PDF link annotation
    • http://bezagsecurity.cz/userfiles/26737998649.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/1dtislqs0ivsnrvp08i97n8ihp/77017755623.pdfIn PDF document text
    • http://ellev.fr/upload/files/69273511164.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/luwulepakelujopaludadareg.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/gagajobobuliwalegubel.pdfIn PDF document text
    • https://tivicom.vn/upload/files/6804129229.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/jalumagiwatirut.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/pukupa.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/97532270906.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/98356500081.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/kurikitetetuxi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/xodifutogafaj.pdfIn PDF document text
    • http://jawarakreasi.com/file/80792947499.pdfIn PDF document text
    • http://tion.hu/upload/file/rezatumujaxaxo.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/92137227929.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/pesabe.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46168736833.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/62725431203.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161f63e0a260---95515877689.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef11859fa9---pajozotobu.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/korejomevofedonujuvid.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152b6d61036d---mamasavipotoxig.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/0347a5bd8e536af0b1b7c51a69fd198a/rimimixalivebubaguv.pdfIn PDF document text
    • https://assofmt.org/ckfinder/userfiles/files/1908356733.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/zigozamo.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_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 9988 bytes
SHA-256: 9dd1ccd3ab06c50ce9f21f35ce1aaa2064a628c72b0a19389a0bb26495a046f1
font_01_sfnt_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 19652 bytes
SHA-256: b023001fdff2c6f2c2475903318700d8bd65d184b759d3ece2cd16db27be53a0

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