Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab2512dcd62681b9…

MALICIOUS

PDF

75.2 KB Created: 2021-09-20 06:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00d6b5c6e443925629f9dd36390f2cc7 SHA-1: 4c4a37fb4e485e037dfd743301eef75bb0b86c96 SHA-256: ab2512dcd62681b9c8f5b7a448ad43e626b9ca8bbcebbc0c2e2800696427f48c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, 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 directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://mediaget.ru/userfiles/files/lipukuwewejodikera.pdf In PDF document text
    • https://produse-zilan.ro/files/19950565819.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/86901111636.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/femasubisoxelulutomi.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/famotebado.pdfIn PDF document text
    • http://clingac.com/d/files/vujuro.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/fe5bc7f9712c7dcbbb3660c2b283ce12/76433447404.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/supalemanibule.pdfIn PDF document text
    • https://autoskola-scp.com/files/bobebaxa.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/xexavowuwo.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/gaxud.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/65406648095.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/nokijakezexumebavo.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614658c0b9c19---gisozaworoserajab.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/49904691836.pdfIn PDF document text
    • http://93564497.com/userfiles/90644069234.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/78024518960.pdfIn PDF document text
    • http://spad.kr/userData/ebizro_board/file/6965274940.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/26638158452.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/79544056612.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/perugu.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/7739269993.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/pumiluguziravuwufemov.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613dedaa7c622---fefit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what%27s+good+to+eat+for+breakfast+before+a+workoutPDF 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_off0000c129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC129 10836 bytes
SHA-256: e90f241b10addf05cf3db76a3540fc6609c4f306ca7a2b8a146af0dcb04fd625
font_01_sfnt_off0000da42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17136 bytes
SHA-256: c48ba90cca27886aa2451876de8724ac42c41fcc878b348b3df43e82a8a4ba29