Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a8e07c8d02470a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-20 04:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a04a31e46ab88c0f003beef19adcb95 SHA-1: a2e8ce2fd70b9ce70f730d268d163bdcbe57f72b SHA-256: d6a8e07c8d02470a9367a718c39125dd6ff364e284b22547bc1d5614d373a322
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and links to IP addresses further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://popnmusic.fr/userfiles/file/mobevesuzevobulemosozu.pdf In PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/56252270868.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135988eba5c3---57893365647.pdfIn PDF document text
    • https://ysh.my/userfiles/file/89552106991.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/dadejaxodaxaxini.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/lesonigigeg.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/mewesenozozuluwelujisano.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/91355870885.pdfIn PDF document text
    • http://hybsch.it/upload/file/pugaradazoleraxasigij.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/65369492650.pdfIn PDF document text
    • https://rajaunited.com/contents/files/79451408084.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5c041080---51719284783.pdfPDF link annotation
    • https://carsen.sk/editor_uploads/system/files/nibeti.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/c9a9cd1094f911ea7d1caef0ed0a1a37/96016416781.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408c8f8569d---7890884427.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rqabjvnrta76ppmqb489jjao7t/buzagezixawafeki.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210903_01B0A5740CBEE80B.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/pilafefu.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/xidetovajakajosipiv.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/bobabugiwixaxapodol.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1646143c4d7d3eb2844647efe107eb41/26507833229.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/50849209779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=5+differences+online+mod+apkPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 18020 bytes
SHA-256: a51731c4582218a53585e1487d6bd2a68dec3bd9809afc2c1a41f0c646c23a0e
font_01_sfnt_off0000fe43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE43 10812 bytes
SHA-256: bb4dd4930485c2dd064fc1fc91f4a73ea45533c0401545da7c4d720610933825
font_02_sfnt_off00011720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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