Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca0079815a1deb6…

MALICIOUS

PDF

85.3 KB Created: 2021-09-11 12:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4db943f01a2ed7c2ffe11a5750bee66 SHA-1: a7e2e729cc5b96df9cab8629ec9ac2ff00096b15 SHA-256: aca0079815a1deb687b7f9c917adbd588b4a89e952b9a67f3a83101813897b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. Although no scripts were directly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/j0qo9ggb4tjsvlsdkg0q6grud4/bijegojax.pdf In PDF document text
    • http://grandviewgroupresort.com/upload/files/84169126223.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/32009556905.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/vugozomuzepizine.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/35272952478.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/pevuja.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/musigewopapivoreduwig.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/89300809685.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/xurujuzepujepofifedug.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/13303945397.pdfIn PDF document text
    • http://gespk.com/userfiles/file/gawenimibewelelewexe.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16130036d8bd1b---dejorevidenapoxadofusex.pdfIn PDF document text
    • http://zenkatsu.dk/files/30403464252.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/tofenimufafokad.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/faxevejetamogar.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e593d26c4---vigofafefalokugipubav.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/guwinotemenujaze.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/82352852332.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210907155354.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/positawilipelonot.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/roripokuropofikukogobow.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/loganetanik.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vitesamukasiramuduvem.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/90201472808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=remotely+lock+android+phonePDF 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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 10864 bytes
SHA-256: f476832bac94154b73d14f0f26b4d88e3a1aed9e9f0fe1631ef2214f080466ce
font_01_sfnt_off0001018a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018A 17620 bytes
SHA-256: 1103f1a618d50f2e7a6260eb11d7117ee6bb92157601385276a8fa550e9708f6
font_02_sfnt_off00012fa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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