Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f0d45bc498a153f…

MALICIOUS

PDF

97.1 KB Created: 2021-09-06 12:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5bb378d18e489b4a70024d783f09979 SHA-1: 16f0ea0c436394ab08fd653571fce808f57d79b4 SHA-256: 8f0d45bc498a153f48468adf8bebfa17c3c7e93cf30b1e21ecca8fed571bd39a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, pointing to multiple URLs hosted on potentially compromised websites. These factors, combined with ClamAV detection and ML classification, strongly indicate a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://inwebjor.ru/uplcv?utm_term=musique+au+moyen+age+pdf PDF link annotation
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa58c1f1e---kupenusimixujimexexaf.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/kalumarulejewemebuwasigu.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/dopisesexuvolotos.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/vemazirenobukovitomu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/698dbb4a4b89006fc8869dfeee47a24a/98783599682.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jamorivoxukukenuxonuwa.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210502193843900807pms94r.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f96c6957474---5120283689.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/78992897997.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/54311218285.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce9cc6343b---jaburadaxatinudafadur.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/26434964050.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb52c8a11---29223199997.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/16921755563.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/woguxazeriwonefanekegotaw.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/96361852867.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19b8b1671---bizumojadatagexog.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nokadirovazuwizagezum.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/89128073877.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/4382895900.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/lakibikesuxexapifudorari.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/732ecb65cd8cdf5c331a81e97c34228b/jafawawelixojodadinujun.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/v001r176a9i3d0j5jeh80c7of9/89585037035.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD7 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off0001257c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257C 23272 bytes
SHA-256: 13ae9a8f899a17b1ebe345a1d4977061e71a2323f07746310b51d47883a91d05
font_03_sfnt_off00015e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E25 10948 bytes
SHA-256: e6bf3146a6fc61c7c72a516a99ca3039544ed13fb98ae0765e99a47117734d8b

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