Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dcbe8da18de78b…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 05:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 012e60ab4c926bcf2a4660296abf66bc SHA-1: 7a17eef7792e6c13f3ac8dbb27bcf935d826bed4 SHA-256: 21dcbe8da18de78bda097b9c6f3745a0d75781d844046fa395d0bfdb552f3d4d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://sooam.com/files/fckeditor/file/1838933748613e6eef7047c.pdf In PDF document text
    • https://lasanisports.com/files/20860728942.pdfIn PDF document text
    • https://maviet.vn/upload/files/kinivujetojosajubefinetas.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/mozawiripobujut.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafe2b73a9---lufesuwu.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/86317162097.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/68925100025.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/91079301849.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7bf6bc67f---77109317563.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/voteguzimiv.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/beboruzaxukedeg.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3a61aa61---danafufamagexa.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/vuvaradel.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xekivujugap.pdfIn PDF document text
    • https://hiroyoung.com/data/files/gubivusajakavilixagefujum.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/28690315966.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/77446538681.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0c8c3daf---50477073557.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/bobulowonidavuve.pdfIn PDF document text
    • https://internationallanguagenavigators.com/media/97385567691.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/62949732979.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109031401553225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=top+10+games+on+play+storePDF 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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 10752 bytes
SHA-256: 79ac7fb5d4d1168ed61e157875ea3d706bd449d935848766c006b4f24a3bc911
font_02_sfnt_off00010ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF4 17928 bytes
SHA-256: 46b961019c95d6c8d0465a19aa96b8bf82f7c94b2de47851671a432984aa78d7

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