Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d1395374e8cac1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 11:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 707c8fb641d9975ec985a845508fcc1e SHA-1: 739ffb053da607970820426e2737e843807b3a34 SHA-256: 92d1395374e8cac178a308173349b083a6ef67abe9ed95252175b4705c4bb800
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating a malformed exploit stream and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs suggest a redirection mechanism, likely to phishing sites or further malware. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://krisoc.ru/uplcv?utm_term=coco+2017+yify PDF link annotation
    • http://appinaris.net/ckfinder/userfiles/publics/files/fatakaberod.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/kotavuzirez.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/xoxasekajuxipadozaraj.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631188394.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a515a3a392---51663415409.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/40722142220.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/16950738224.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/wilet.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133550cb92f7---50874601265.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/rewirewag.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/zoragovufodilokimuz.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/82047250461317ccb66b50.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/rukaromakizikevuvud.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/kilojelofafikegodowuf.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/19640546260.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/87131901522.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/jidejatumi.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/fakugopi.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/tezikitalukizodidiraxi.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c359924083---rawafogaxiwutanatete.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/63799737983.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e93ad5a0a4---mifokozewaw.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109031525058095.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/rezugajitukomewubuj.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/burowat.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_off0000d53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53A 19856 bytes
SHA-256: 2ee327f3902eeb4959f42c3012cae9cb7162e9f50da8a225f71854a2ac520f4e
font_01_sfnt_off000109cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 10008 bytes
SHA-256: c3befa968c3f8ee4bea6f2409e2db10a80e5acae1794f5aa30a15f81a2735177

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