Malicious PDF — malware analysis report

Static analysis result for SHA-256 48eb675b37ccd2db…

MALICIOUS

PDF

347.5 KB Created: 2021-06-10 07:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 63ebf4d5dd02fa1ebf2f207c69f6eb3f SHA-1: 9cc37bd9c01607519e268362efa3fd294dd23651 SHA-256: 48eb675b37ccd2dbaf5990d3495d15a0688c6136ee44d9ae955bdbfe7f1f0f9c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 5

  • 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.
  • 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://huntic.ru/uplcv?utm_term=chaucer%2527s+prologue+to+the+canterbury+tales+pdf PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/fefb579d16816edec688db5dd474831b/lokunomejuzutofumorepig.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c237a627929b91b6348f85e65f35d619/loxolokovo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609511c1e86cb---94031743363.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90844cf68---wijudufakonobodosa.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/755846215.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/32740577147.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16082b2a6a7cd9---bataki.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160908258375dc---gofasisidilukikoxududigo.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a32588b8---28223882821.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1b5608827b76c0013934c9871cd569ce/jusigelavumukotawamavudog.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510215625682653.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd873c5cd0---75287535394.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/3607ff871b74441da91fdc4e8353e55c/26205544106.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a88f8cba06f---40941998855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00052840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52840 5600 bytes
SHA-256: 5b83812fd036b356afa8f6be22bb561c5b02d6171142d58a95ac4762a729115e
font_01_sfnt_off00053b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53B44 11180 bytes
SHA-256: 1ffcfa2df87330b8ba3ab51772e13bc98c2bdb7282f2650b133cd842df1b0aa7

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