Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd2ced88a01724c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-30 10:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b84fd1a448409d783156b99e20ac13a2 SHA-1: 832f9229754a3e6624cdd0ab02af84b0487670fa SHA-256: acd2ced88a01724c1aed95fe966b8d37ba792e9b4da570af238977e70160eb5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm that redirects to multiple unknown PDF files hosted on various domains, suggesting an attempt to obscure the final destination or distribute a payload. The presence of external URIs and a link farm indicates a phishing or redirection attack pattern.

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 https://bursaphotofest.org/uploads/files/60706548077.pdf In PDF document text
    • https://triatlonshop.cz/userfiles/file/sarusizupegebebosozed.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/6704315767.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cda4cc7b0e---kofumogavo.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210924/file/16324509602521.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/gowajujepupunitaxatedap.pdfIn PDF document text
    • http://safetruck.gr/images/file/76564770574.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/45816515730.pdfIn PDF document text
    • http://acril.ru/ufiles/files/tabawukudufejexaguzo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/52106863101.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/16098565993.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/70776068971.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/83530916308.pdfIn PDF document text
    • http://www.ximangsongthao.com.vn/app/webroot/uploads/files/94405351264.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/6621686347.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/71141638021.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021db219a9---nelomi.pdfIn PDF document text
    • http://kvrhousing.com/uploads/34667830226.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/26168698603.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161556380a6fad---41915666235.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/79789184810.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/34683518265.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/rugumasikufifewat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+recover+deleted+photos+from+cell+phonePDF 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 18500 bytes
SHA-256: 55ebf26d802200c35eff5b98d2021432eedfae99acb12d61836583cf813defdb
font_01_sfnt_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011E 10776 bytes
SHA-256: 07a1c70de7668aae1c3197d5dcf34c2b4471981c43871f04321de066ded2d0f5