Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c19055a2a0ccdd…

MALICIOUS

PDF

76.0 KB Created: 2021-09-06 11:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ead4fdf1c493b03a1221df6718e1267 SHA-1: 6434cb8141f7561525a8d6b4de7aec58bcd76bd3 SHA-256: c1c19055a2a0ccdd02f50d6769682698494fba5d0c6bcfce94afda4e68d03c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=bidayatul+hidayah+makna+pesantren+pdf PDF link annotation
    • https://delaneyllc.com/ckfinder/userfiles/files/45266572731.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160774f4216063---zipijigovigunibape.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/27840677220.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/19f6e58657c220611b0a22f082729f32/nikosabov.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7f2edc690---59704681352.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/84193474853.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/bb022bb3ea87cca66214633262583c7c/volagesokemona.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/bomojoxezel.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5d7bf0aea---26600581035.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3be07cd9300ee0bf8f58e2c229f75b31/77477520193.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/73829343007.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/6piotvo3tacuinih2g2ugnfeb9/50080602800.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/b18e472a5ec047fddc4f9d7e0786aa0e/53610694429.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/vowidi.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///dokurajokorexunotefo.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/6994114818.pdfIn PDF document text
    • https://cape-electronics.com/media/file/roxewenevozofi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f0657441486---susofekozedumawikaf.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c91d45292---zexusidafilaras.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/gisenodapijuwebemaz.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/13787785674.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/sogugujatafufe.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_off0000c0ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D1 11000 bytes
SHA-256: 0d0511c2dea72c801f017824dea2ea2e495d969cb914a918ab6fe4e5378553b6
font_02_sfnt_off0000f232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF232 18684 bytes
SHA-256: 2665dc707cc2865e2240cfe5bd630ced05a154e220e8d7184a6656c3f664e2de

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