Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65e2a9e07519bc0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 21:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b62337ee7e04f938eb286c9f1343971 SHA-1: a4259d7843034c51d06a228e6937e5db46f20d35 SHA-256: b65e2a9e07519bc00af608734c4c648faa301715539e66e945fad42cdda2166d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to lure users to malicious or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=ear+speaker+not+working+android PDF link annotation
    • http://moriefrusca.com/userfiles/files/32192857028.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/15919620007.pdfIn PDF document text
    • http://castel.lu/userfiles/files/96943765642.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/dedoki.pdfIn PDF document text
    • https://rm-parketi.si/uploads/nerumifilixivurepereno.pdfIn PDF document text
    • http://bamor.org/userfiles/file/92277705122.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/zevixusoturogi.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/60827288557.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/51315342594.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/56922747524.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350d2988a38---57246632914.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/finumaki.pdfIn PDF document text
    • http://henca.com/files/details/file/koxeworatar.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/finimatabizavob.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zotufomofonutigokax.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/99548452620.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/97670301581.pdfIn PDF document text
    • http://iscelenie.info/files/file/jiwizur.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/mb75osk0rmte15bd4ngb36flg3/sagaxanobewutunida.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/80257729710.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/32587812067.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/zagosabidedisi.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136727a33a48---nozes.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_off0000e32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32B 10684 bytes
SHA-256: 983205a965cc07440d41730ed00f659ccc1766c626add8499de842142cc892d1
font_01_sfnt_off0000fbac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BE 18416 bytes
SHA-256: b7e3f9ead5b2d780b45c0639eb65fce6befd8fdb5d2a1ca6c560310141bcc3cb