Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7280d7a5f8d6bd2…

MALICIOUS

PDF

85.6 KB Created: 2021-09-11 09:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d335fc1e42f4817a94891883b46736b4 SHA-1: f9da82df7a500f9849e1d5eac5be5c0fff70dcb7 SHA-256: a7280d7a5f8d6bd28b7f235b0964f12f38fb0368c5580bf11ff704c4c01e3b88
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://nomylo.ru/uplcv?utm_term=pokemon+yellow+version+gba PDF link annotation
    • http://fasson.vip/images/editor/files/10771759027.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613af6cf94b74---34247949650.pdfIn PDF document text
    • http://underbutter.cz/download/foto/jamurixetipaxunupu.pdfIn PDF document text
    • http://strandedtattoo.com/file/77222637887.pdfIn PDF document text
    • http://rent-lease-no1.com/userfiles/file/20210910060508.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/42497388099.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb99ee0398---daxuwezigixekepulukexuzu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb9fd53e2c---tenovawak.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/kotinulajubo.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/nukup.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161386afe85cc9---musawedejavo.pdfIn PDF document text
    • https://ratoempat.com/contents/files/jatupefud.pdfIn PDF document text
    • https://cubic.is/userfiles/file/sokusabex.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/957cab8547622062c3ba9b7959ff0e22/fivuzu.pdfIn PDF document text
    • http://e-sheremet.com/img/widapurelozulexidatikoxaw.pdfIn PDF document text
    • http://synphabase.ch/upload/file/53346103741.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/051556131281.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/85889127252.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/donetizuromenoj.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/ferigepa.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/34131303642.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/pogamad.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/pimikufajaropibanuf.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/tilusolik.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/xodelidavorimanox.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vme1ntten2osba70q5ememn9k7/nizezoka.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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 10852 bytes
SHA-256: defc48dd20e849749b099367b0fb243489b5ec0c39c8b07ddd21dab83c7e26a5
font_01_sfnt_off000100a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A3 18576 bytes
SHA-256: 5f0038ca657e898179f92f19d0f3ced44c4cb20e5fae0bd4c11c738e73dfe0cc
font_02_sfnt_off000130d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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