Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c180ab72e72346e…

MALICIOUS

PDF

92.2 KB Created: 2021-10-14 11:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2281f88d5c8c542cc9291eee44024b0f SHA-1: b848e8fceae2e004ddec15ce165ce8206a20b633 SHA-256: 5c180ab72e72346e16c96228055c0c38a8b6d434beeac110e8d057dc21919b25
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The PDF structure itself does not contain executable content, but the embedded URLs are designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://gsm.company/ckfinder/userfiles/files/wodomikaxumuxapi.pdf In PDF document text
    • https://proartgaleria.hu/files/files/5244328093.pdfIn PDF document text
    • https://coombs.gocascadia.com/images/cms/file/zolesimafemazi.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/37590212894.pdfIn PDF document text
    • http://technocom.pl/editor/file/wekozuj.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/lapoga.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/64721751374.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/80876128686.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/vorodavuredexa.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/3277192531.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/kuvel.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/b7a766ecf9fd3d751018f707c1402d40/86004303042.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7d14e28c.pdfIn PDF document text
    • http://meskerjager.nl/media/files/tobovomatepekurawo.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33745889d---zerelavuwiraviveza.pdfIn PDF document text
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/zaxagotakijuzixifafizorus.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/34783793796.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusopibiminijewuna.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/vikepakuleninawutigesu.pdfIn PDF document text
    • http://vtaky.sk/media/file/74046002818.pdfIn PDF document text
    • http://unite-chem.com/upload/files/58982341322.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/supatuvixesasonelezija.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/fipiwaxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/TxADE9PCSUw/uplcv?utm_term=coulson+and+richardson+volume+3+pdf+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/47900975738.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_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 19284 bytes
SHA-256: 950fa20f8ab3d85250ada719678ac6d93a50ae620ebb4dbb5e322dc2208db177
font_01_sfnt_off00012e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9A 11240 bytes
SHA-256: ede2464ad40789ffbee59c43c5e21f1c73ea7d000ba6d87817a5df75fca81e4b
font_02_sfnt_off000148db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1