Malicious PDF — malware analysis report

Static analysis result for SHA-256 801bc1c1f2c7ecde…

MALICIOUS

PDF

79.3 KB Created: 2021-09-23 04:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ddbfbd4a9db078dbcb3d9fd296ce87e1 SHA-1: d5c283a8386cfa0316fe8937bcd88091be2ff18f SHA-256: 801bc1c1f2c7ecdebfecfebe94c42c60d1fea28070bb5a22969eeac92b71441d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to manipulate search engine results or phish users. The presence of embedded JavaScript further suggests potential malicious activity, such as redirection or exploitation. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=6+letter+words+with+v PDF link annotation
    • http://autostyle-japan.com/js/upload/files/90960509955.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eu86ebb4d67t8arkstm6i5old7/mimudosagasuludezejobije.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916110323.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/nimamovif.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tubogupob.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ab865093---9738239127.pdfIn PDF document text
    • https://servicepapik.ro/files/jumidatolekoxe.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/51307247392.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/96698174774.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vumom.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/1ac50ddbc329b3985da73ca200b89ee4/nidexu.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aa16230c7---jaleloxelu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba5a99a18f---83671606017.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/52573605131.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/menexevisafa.pdfIn PDF document text
    • http://podarox.ru/public/files/60547780817.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/60281792506.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/85504922063.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/57740629413.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/12288230925.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/46024660171.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/slpj71s1qil0tg24ps0pep4t53/93661643276.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_off0000d16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16B 10304 bytes
SHA-256: a5b554d5a4ecaabd7123ae83f0f911e8dcfd038271c04cdf7342c3d678c708eb
font_01_sfnt_off0000e8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000100e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 18112 bytes
SHA-256: 7cb30f600597a5b11f67a5afc1aefb5d0096ab3e5ee68d1baa251c90fc22eef4

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