Malicious PDF — malware analysis report

Static analysis result for SHA-256 effcdd9963c37e8d…

MALICIOUS

PDF

86.9 KB Created: 2021-07-02 05:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1ac5d53f28a89926673cc5a64da82d05 SHA-1: 78afbddb1aa6ba38c37e0ac033f17a04cb97f4ba SHA-256: effcdd9963c37e8d431aae7dfe30cff524867e55e96f186942809a550648486c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4a08ad3a1---kepufopexaporijafufowibi.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb78d46e0d---fexulugavova.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dupiponafixupuwos.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/94a84d0f2047d621574b54aa5d82ff57/neruvubidolapofisatigo.pdfIn PDF document text
    • https://cooperspick.com/files/namogizidavojoxibufid.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/kagagakisajakatode.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160948b0f674a6---78947878618.pdfIn PDF document text
    • https://12shio3.com/contents//files/65089806490.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/rome55oqd0vmlgc41vuk71skg7/43270552303.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/34459878577.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/kukorutob.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ceb158d0edb---tewixevuxezawibivusolin.pdfIn PDF document text
    • http://renovator.cz/files/file/kexebojuzoluludevezi.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/rilefotufanekusilu.pdfIn PDF document text
    • http://apvn.info/userfiles/file/50810555481.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986f4d5a237---37882423101.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d44b89b912---zegupewad.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1981492be---48880332319.pdfIn PDF document text
    • http://willbramephotography.com/87802280422.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db951cdcd92---5025136075.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/wivepapowejefidelukepep.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bf09dcc125f---26775765412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=red+winged+parrot+pricePDF 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_off0000f2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CB 16716 bytes
SHA-256: 3a47b4bf8fafe3f349cf52a8f5d4a68c2c4393e93df15089e142c10f7d949475
font_01_sfnt_off00011e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E34 10604 bytes
SHA-256: ef9cf7504d732b45b4428a054d1164c847cbdf77a1332027a397ce876cdcb8b7
font_02_sfnt_off0001366b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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