Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa10add433206ea…

MALICIOUS

PDF

95.1 KB Created: 2021-09-16 17:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 68817c73b2878b38b8c7a886769b3123 SHA-1: 2d6d77fe6bad5b65f2f791341e6efa06f019eacf SHA-256: 1fa10add433206ea44c45af1a623eb48e3fd32738e033e2e7f7554bb4f832560
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised or disposable domains. The PDF contains numerous external URIs, many pointing to potentially malicious content or phishing sites, suggesting an attempt to lure users to external resources. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=arise+sound+system+apk PDF link annotation
    • https://purefeeling8.com/data/file/vimiligowu.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/vagapinogifefifogedatu.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/80349832542.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9a2c109---mibenag.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/84036362125.pdfIn PDF document text
    • https://ikansambel.com/contents/files/wakuvozegiteb.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/25171917970.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/16983421196.pdfIn PDF document text
    • http://internet-trade.eu/UserFiles/file/nobozogovofuvosen.pdfIn PDF document text
    • https://sapporopools.com/contents/files/zebotijapusivepitavawipi.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/tikanilidido.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613223d011aba---41271848918.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ab493e746---zunugaruvurugumuzapefo.pdfIn PDF document text
    • http://gibisch.com/files/files/24921486621.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/84640347775.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364ba07aa81.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/lubulokawovitakoxop.pdfIn PDF document text
    • https://masukpt2.com/contents/files/19461504327.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/ruxibivonemagolik.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/sejuzumefuwafakoxodok.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/81349332993.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7dc86582b---62131885692.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/47127897115.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/49660160655.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_off00010806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12018 20136 bytes
SHA-256: ad6f1d67fac91b7dc24e93d1abc5a17fdaa824ab1657a850a636951a54a63887
font_02_sfnt_off00015442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15442 10792 bytes
SHA-256: 59f91006d3b383273e4ec781beb1586d6b3a3ea6547ae4a6ae08620db7b4d94e

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