Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c8ea7334d0cce3…

MALICIOUS

PDF

80.2 KB Created: 2021-08-27 01:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aec634f5b11e178e94e94464e57cc044 SHA-1: 586da8e7ba0b0eba5c1cf494acf5daa92a5d5365 SHA-256: d2c8ea7334d0cce310e7029f5f83f1eab45a9f0b16b93d89df1cab3908a52efd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content or for SEO abuse. The presence of numerous unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/474061677e574a5ac323b58969bfef8f/22749101038.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/5825622827.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/kavefokif.pdfIn PDF document text
    • http://zubrcup.by/files/files/71078117428.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8533e22e---44151014343.pdfIn PDF document text
    • http://guitarenko.fr/img/files/nuwovapukasekobewor.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/bixotag.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d78bd52c10ac5268532903e31fc68ff1/gakufuniwo.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/rabewoxedijofet.pdfIn PDF document text
    • http://peoplefoster.com/pliki/xafajigopavifawaripuluvo.pdfIn PDF document text
    • http://meskerjager.nl/media/files/88658168521.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/fuwixovobipodife.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/87798078167.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/0831f8d1475b8ca173059413a239f33d/biwozalofemesurunovot.pdfIn PDF document text
    • https://cncunse.com/d/files/vekuxakutixujug.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16078ffeee4f1b---wovifikapelutomagidus.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/50127321633.pdfIn PDF document text
    • https://studiorampinelli.com/file/dakupoketi.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/27313944348.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/bmjfupjkp3as2bg9fl41ksa2c2/21746662267.pdfIn PDF document text
    • https://masukpt2.com/contents//files/pexor.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/tufabadexigevusimijudinaw.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/6819220794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=1+bed+1+bath+duplex+for+rentPDF 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_off0000d47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47E 10632 bytes
SHA-256: 1456cfcead1202bcef36306d9f375f9d7a7dc15ea1fce4dc59934ffd52db1579
font_01_sfnt_off0000ec8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 17868 bytes
SHA-256: 9d4f2649f5b7c80ccd792c6ec4afc09a4d01f78109ec0fe74702f14eeb3a7da5

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