Malicious PDF — malware analysis report

Static analysis result for SHA-256 f552e8a2f3af9372…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 03:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8bc8fe728ce9cd17262e216a8b6063d SHA-1: 5a0020acd6f80a91ed914f163c7556570ec0e455 SHA-256: f552e8a2f3af93722f17930768b9e89152f70687a7977049c89c23ba3a20bd12
96 Risk Score

Malware Insights

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

This PDF file contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm. The ML classifier strongly suggests malicious intent. While no scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to potentially malicious websites, possibly for SEO manipulation or to host further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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://cpghollywood.com/userfiles/files/84989841627.pdf In PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/6906911724.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/kofijufanu.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/wodufaxoxi.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a2655539a64---kasizofitixatijo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/962c2cf0a708ed7c7d59b6c1906db009/fisixomixopiwomupeku.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/42612848397.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/30633240791.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/romuxusizazosukigi.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9296fe3a---gigubibekigefibaxuweru.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/todagajexe.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/30794074356.pdfIn PDF document text
    • http://myslizdrave.com/soubory/94850276860.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc70bdf3f5---9013082699.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608468c04fa72---werizur.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c9898792fd6---45299676687.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cb17612cd---59340459202.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/425d96f8633e7e2f5b9b447d5ed538b4/tafitodaman.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f31d574bb---sukedebawavigafo.pdfIn PDF document text
    • https://ikansambel.com/contents//files/sugibizatabukopawexaxati.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/97183407539.pdfIn PDF document text
    • http://108homed.com/userfiles/files/21200585894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dc+generator+problems+and+solutions+pdfPDF 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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 11204 bytes
SHA-256: 65632cd03b66f5ea15be90f47cb6e479c9abf8af055fb2532c4aa41584994b6b
font_02_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 18548 bytes
SHA-256: 50700902d210bf5806718980e2c94190f02d1ee3e0161a7eec5f6132f4ef44d2

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