Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb46b880b96b9e23…

MALICIOUS

PDF

96.3 KB Created: 2021-08-10 22:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 56ecbe21360be04ffcd01bafe1900ffe SHA-1: 72a979111ae0022ab5a272d96a14e1244d5d40e3 SHA-256: eb46b880b96b9e23308b291714eec269fcbe62fd7ea550b06e14a1aa7e56a60f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://yangs-ns.com/ckfinder/userfiles/files/20210610152412.pdf In PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/dozipajutogegaru.pdfIn PDF document text
    • http://flgr.ru/files/files/wivinuzu.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/bibewatukajozofewabop.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/varurafedimuxetigo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/zeduzedijoko.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f48704da1---kepot.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/valifapixenafogetedug.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf90d04af2a---marogajawodebogezexe.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/24403423ffd744919f9e973d2afec0ab/xugasabodidivu.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8968471d34ca50cdb9c4f717ac26d057/lujurax.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/pefakaxofadaxapavofodo.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d0d6571e11845363f43ae3db0ae544c2/desedoderafat.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/wogafogijazi.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/59038412687.pdfIn PDF document text
    • http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/xebekidorilagaxonawisazum.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ce9a5313fe88297553908d0bb8733124/69608548317.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/f3gtukeclqjq8q9n5vs9mnijb9/gakewubuxudoporujapexu.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/61312301033.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15f6d982f2---zijijafazomi.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/77159027103.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee659cc5abc---23034925884.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/nudubigonojakejuv.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7lboab21b48ilhpqslv1hjp4hf/36245751118.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d78708d1---xikuzezavesofopav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=whatsapp+dare+games+for+friends+with+answers+in+hindiPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 33856 bytes
SHA-256: 8158d3c4262f5379efaea410c6277a15e60186127bbc8fe99bb8340d7bd37c3e
font_01_sfnt_off000110fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 18104 bytes
SHA-256: bcfcffaf3952ae28ff09c671ff1289a6903be9cea89ec3c624ff7eebcff4de4c
font_02_sfnt_off000140d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D4 10980 bytes
SHA-256: 9b76ca9dc0cb0353ebe29e6d4ef4ac05fc41be80b50d7a80c1b7fb170832c3e2
font_03_sfnt_off00015a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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