Malicious PDF — malware analysis report

Static analysis result for SHA-256 a57f824d1150975e…

MALICIOUS

PDF

75.2 KB Created: 2021-09-21 09:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f71ca501c3f36c753b08e48cb76660cb SHA-1: c52fb51955748be26b5f69553c83187ae3ff2a5b SHA-256: a57f824d1150975ef7af3079f4af6d92e9701870c338a51cfad567334cdaa47d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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.bash.cl/media/file/xudenatinopiruseripib.pdf In PDF document text
    • http://medicapoland.pl/uploaded/file/bokesavujezuziw.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/puvuguvifozem.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zenufosazik.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/12834028408.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/94558745818.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146887bab204---63166366323.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/97368093746.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/94437219809.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc7af0f560bd22c76bce2605fd75e06/36765584328.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/20285417532.pdfIn PDF document text
    • http://korytnica.net/data/files/vijekazezosanaxiwok.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/18607957798.pdfIn PDF document text
    • http://intimatehotelpattaya.com/image/upload/File/82751814218.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/nujofalezexivubopoxe.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/jevigajutalalam.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bb7b3a4a8---85974770542.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/revexulaga.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/849f56a7ed28f923b512743b75ab6bf6/fixanekifodam.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zolalopetomu.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161385e8462d2a---59279089612.pdfIn PDF document text
    • https://aneri12.eu/res/file/6335806660.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161437fb89bb07---demuzutavilu.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/56975448872.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/77906406544.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/fibaliwarizelirejor.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bisowipenomewokedu.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/fafikopewitoxorewaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=world+no+1+game+in+indiaPDF 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_off0000c443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC443 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5A 10372 bytes
SHA-256: 498c0adef0cc670014dd44f7737193dac8a77a036b063711708ea2d765cd8bd7
font_02_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 16728 bytes
SHA-256: c0cb507fe17cc435269c6ce895453d29aa83cf91895631753f9d7c36c21aaf6f

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