Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac583876959cd891…

MALICIOUS

PDF

82.9 KB Created: 2021-09-09 18:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64452a25ae35792810476d4bd2a73926 SHA-1: 437c9b2e6d90cd9a0fb213012070d7cb96ef37d0 SHA-256: ac583876959cd89197e75d8c43980b42ff0e5779128cd931d0d6dbb9162e185e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms on disposable or compromised hosting further supports the conclusion that this file is designed to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://eyupsifalibitkiler.com/resimler/files/ninisiguladud.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/rqt0j88oi6b8lkrcnigu81u6mi/bulojixor.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/db40ad6c0676d12b090a17e3fedf6401/zipirijelamekikene.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/zasemetujigutudalotine.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/78799041498.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/jezetimisutometo.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/reseg.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2c5486f7be903a85456ec12ce99b5962/64887104764.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613449c766273---piwasopeporenud.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/silisiti.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f256504c---80839050039.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/gonopoturivomujemunu.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904221619414520.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/8853884352.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/22213643326.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dasekogezirabo.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/33202154927.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/27650916685.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7e7755fe8e764b93efd551b881a383e0/19154204054.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/6312960686.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/femowafasew.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/32074088243.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/76343469015.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=percy+jackson+and+the+lost+hero+pdfPDF 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_off0000de05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 10960 bytes
SHA-256: f9733b2face8daa55c2a7bf1e7d1a1f987c0dd114106e23a27ea6527c9a9cfba
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 18060 bytes
SHA-256: 99e1becda62b3a45edfbaab93b283383715e69bb0a3ffad790a817c16d590d6e

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