Malicious PDF — malware analysis report

Static analysis result for SHA-256 b300bbfc8fad8fac…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 16:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 34c1a612700090dbdb2a626b1bf890bf SHA-1: 58d9bc68725475c4e699983c92e56c50183d3afb SHA-256: b300bbfc8fad8face1d726812bff5fec0afc9d9adb1ab0c6af761c150e8b3c60
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://bensonlandscape.com/editorData/file/19705656956.pdf In PDF document text
    • https://aynadakikemalizm.com/resimler/files/45785545002.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/puzor.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/28010050032.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/romol.pdfIn PDF document text
    • http://pasaru.com/upload/files/84920932175.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbd73b5d0b---gulapotizoke.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/51860690521.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vunamikone.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/vurusimezisaxiwapesis.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139ddc6e0184---vibiranujoliwefazuxuw.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/vozubodupasi.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/boniwuvotexedogosaveta.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/pefiso.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/fazapolupurugopak.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/37748839568.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/69742231531.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50cb3b77d---sezez.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/zujewuti.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/sijagoxodusetixawa.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/43481304055.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a465ac41---pebopunoxu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/11073688612.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/50294438498.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/21221741997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=marvel+contest+of+champions+hack+no+human+verification+2021PDF 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_off0000ce87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE87 11288 bytes
SHA-256: 1343cb16947192e29978c6ebf8077fdf49d153b8ac87d760829b16a8f5a8361a
font_01_sfnt_off0000e8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F2 17448 bytes
SHA-256: e72430ba9025f25cfc66e968590a3ae02da060e4a2e177a0b54495486727e3d2
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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