Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc5b8095ca0bdc0…

MALICIOUS

PDF

159.6 KB Created: 2021-08-06 19:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55c67b56fcffe57647eb4ff41afb6771 SHA-1: 1f79935e9246a6b3d0254490f342a033da9bde31 SHA-256: acc5b8095ca0bdc003da28db6ae2131c2e99c4108b7761938712b5e712d263ff
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to disposable domains or compromised CMS upload directories, suggesting a link farm designed to redirect users. The presence of these links and the overall detection profile indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/1295968789.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/mebinokewidixarejolepa.pdfIn PDF document text
    • http://duralinealu.com/upload/files/misatusukibipimom.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qsce1tto83n457ot06r6pfinr2/22578344678.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/83459666025.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/mojumokiwofepotus.pdfIn PDF document text
    • https://datajournonepal.org/files/94145527401.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/18238778486.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/lufulodofanaxudusuwike.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/47694234383.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/50897966647.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/11812421083.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/d827fbc00237d20bf1ee2f9d70192c86/79510310572.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/69285697625.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/kimabomafuwalikiv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080536296b43---87620429872.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/36e9a7a7d1ed0ff61e5ad64382be6200/moxozasurofaxa.pdfIn PDF document text
    • https://claudiodituri.it/uploads/pipubozuvugukoxoxa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/74095046827.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16083cfaa0c962---xinevajuf.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/pabewixijavejufugidokaxaj.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ef7aace1c---nosefenijuga.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607638525297c---rurajafoxera.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/73035789044.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16082e3590fcc4---dobotoj.pdfIn PDF document text
    • https://parkettworld.com/upload/files/24061287363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rodr%C3%ADguez+valencia+joaqu%C3%ADn+sinopsis+de+auditoria+administrativa+trillas+2001PDF 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_off000207cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207CD 19132 bytes
SHA-256: a3cd62366859efa8322e7921520335d4ab59886b5cdb7b39626bed3d1df1f009
font_01_sfnt_off0002388d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2388D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000250a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x250A4 11760 bytes
SHA-256: 9bf9163e2264b3fa536e1c587e973f59b01146fa2a4e4fd55daa151f810d6993