Malicious PDF — malware analysis report

Static analysis result for SHA-256 445607b11ab792d5…

MALICIOUS

PDF

78.0 KB Created: 2021-07-28 06:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10afaa8ae1b1fc51c60eb50231dcd3cf SHA-1: 7ce58ad5957af58b5971abafd737ab4ca539dfa7 SHA-256: 445607b11ab792d5205b9f49aaf06279d0b90e980ee1447e01644416136b76c0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the nature of the links and the PDF format itself can facilitate malicious redirects, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9436

Heuristics 5

  • 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
  • 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://bugaboo-buffalo.eu/UserFiles/File/33660917030.pdf In PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/ci7a1mtk4o3tlvgfrosbkd7b17/34819117151.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/15433727588.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/jejojamovomavajafi.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4d1ebe020e2957a5074019634c190c3d/dapagadikodi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/uk7ragaollgg0bt47cblo9miq2/76655072935.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d28ab41bb---zoxajupifinisivazebiwase.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/aeca87380af7a02f0c6c02e4bff03aec/fipodamamumabuximexixejo.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3daec64ad---29817382568.pdfIn PDF document text
    • http://poiskvod.ru/images/file/fopoduwavawijilaro.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf395a695a---xokubobawu.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607988505d991---newurigi.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/1518409863.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af0509df87c---dadore.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/u5gu98ud6ik4sqccbv3nmq9ka2/safasibezamemibiwew.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/gumufiwurakunaxa.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/relebetovula.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/fadunevokov.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/j8okdnnl9gnifshj93s2m528n0/muvem.pdfIn PDF document text
    • http://aceranalitik.com/ckfinder/userfiles/files/21561744226.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/78988564317.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/5221324403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=kcal%2Fkg+to+kcal%2Fcup+calculatorPDF link annotation
    • 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_off0000dda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA7 17156 bytes
SHA-256: 1081e2a6c3e80362adfd385cf289aa75fdd4a48d7cb2b190a1d2a6ddf8ccef70
font_01_sfnt_off00010a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1