Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bb93a1dd8d0f01…

MALICIOUS

PDF

96.4 KB Created: 2021-07-03 00:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cea3b64b63edaa7b470dc6ae2523f3cf SHA-1: 2b99c15193d9c68075d71a32ad60711ee735d7ae SHA-256: 50bb93a1dd8d0f0194d38cfc73bfbebfe5ee427d481dc887cc00849194980d50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. The primary attack pattern involves luring users through a malicious attachment to a network of potentially compromised or malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://walnutcreekguide.com/wysiwygfiles/file/bivokasetuneranafa.pdf In PDF document text
    • http://qtjdb.com/UploadFile/2021/06/08/file/20210608_082311_150.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/leroxusodoji.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086101227db5---mopub.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/11366434194.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091dc985f5de---goripowinaze.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/jowisozivegi.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/99bc0b4150efe843dc36fa6b756b5f61/sutusunumerolelitasozuma.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/50630523896.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/55d8965b408c49776c419ab11bbf4b9c/butetodasiwibemelew.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf56a1a4106---83490384077.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609495bca2de0---nuwanegit.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b88e44e9f31---64263524210.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084272839ecc---jafuzibanabekeregutesoza.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6938936f287ccdb97759807c9721a4e2/difekejizusisiliganida.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088a903352ef---nuwujufotamanamunejisonaz.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12d88aafa.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d912329e16---81293435017.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087123252b26---bamegigu.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67c53c648---zulabe.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/53649945008.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/77016016077.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68f2a4e10---14329888130.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/p3jhf334vkvrs403nmi4u3n163/katoderesijasozebom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=swing+low+sweet+chariot+wallace+willisPDF 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_off000115c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C1 10672 bytes
SHA-256: e7988e1c425c0ded8072bcebe886410a39ab97b687fd55c9dbca386c5d92bbf5
font_01_sfnt_off00012e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 18108 bytes
SHA-256: 42103c763278c1ebcc8916fbc7443ba725cbc4fbbc7a84c3d9a122ab34719355
font_02_sfnt_off00015d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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