Malicious PDF — malware analysis report

Static analysis result for SHA-256 c141d63527d2eec3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-23 12:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7b5eb2b63feac32af7c10637b3f46da SHA-1: d4d7f061f27f2e67b976d251e3fb35490a4af937 SHA-256: c141d63527d2eec38f45681fed5aa323b4aa2caecefcd448f95a54351de3cd22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with multiple URLs pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure strongly indicate an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/aa482a7f5a7719c2db976e044d072b52/jesanux.pdf In PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614577f018df3---38718965146.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/tuwajajupa.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210923091407.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/32484092099.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a0062926a4e670848e87d722e3629324/56901722500.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/pezulax.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/38293331301.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/52799550376.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/56813370827.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/47313609845.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/37707603145.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f635d519d---23587284734.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wudubunoxiduzamidipuga.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/sobodo.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/21094758831.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35929779701.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38105782150.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161494b3902c1a---38048794372.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/24211122785.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/waguzezodenatapado.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/kilefitenuduluxim.pdfIn PDF document text
    • http://ocung.net/img/files/muzorakefikadiwat.pdfIn PDF document text
    • http://getvisa.ru/images/File/62908452821.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18128672184.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+download+pubg+lite+new+update+2020PDF 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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 10860 bytes
SHA-256: 9f1d1a7bad2638d1872d4e15bc89483232123e79726a0334efbe194c074ce284
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 18020 bytes
SHA-256: e4989065765b134ec85f33f7a193137e070cd4216ee73d07687be0364f4eea1e

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