Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1268d0bf0527862…

MALICIOUS

PDF

86.1 KB Created: 2021-09-10 15:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3fcde8803e545d84e8bfc36c74b73fa1 SHA-1: 667f9de2ac0924257b298f352a27ea6c31525d69 SHA-256: d1268d0bf05278621f2c581c2c3a744a00e4f746ed63e6c710dfef189cc7f996
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=types+of+graph+in+computer PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170241b346---88283660955.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/99317947174.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/84326308727.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/3257003725.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/38731205002.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a08b8239c---pigurunotosodasulerapen.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/zewanofozodavajixamafara.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/80347691586.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/wuvefudujikeruremibaseriw.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/71643147482.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/dedazujizotifak.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/5425835462.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/dupasudujazijulot.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210909063829.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/90813172179.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/ditibapotupifozulapeleso.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/088017b6d2818b1d48b0635dff872a0b/2931082543.pdfIn PDF document text
    • https://medtek.vn/storage/file/gaxitinuwov.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613237ee4e074---44553950150.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109030053585551.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326006632ac---54889709965.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304d81c83fd---bunifokileniti.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/kofubiropifekosomajo.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_off0000e7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10011 11056 bytes
SHA-256: 8817874628ba3ac0a5716a0005dd77e6ec298456aa670904ffb3357c3581471d
font_02_sfnt_off000119bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BB 18928 bytes
SHA-256: 2ea7dee663710ce25916e01a8ee51f30dd28fcbcc2bba4663716b96af5caf783