Malicious PDF — malware analysis report

Static analysis result for SHA-256 c288f5372a05c7fd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 16:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9cabc2cfdbd1d42c8e9414f7d68df83a SHA-1: 60b70fa9970aed2dd64c057d959a39a5505988da SHA-256: c288f5372a05c7fdc7226917ee7b3ed487a79766627f691c180312d45e18d313
156 Risk Score

Malware Insights

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

This PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atlanticcompact.org/userfiles/files/74572030354.pdf In PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/vojilixenilekolebuxeja.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210908121407_93218929.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131295294fee---91424694711.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161351e6764762---xojato.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/mumazoju.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///gefig.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3d4d7b1e---wikefegirowewili.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/lajunasigu.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/13769434704.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/pububuzomokazapujawabobug.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130b41c1c4ef---simunu.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/69961190434.pdfIn PDF document text
    • http://storemisr.com/uploads/files/51747845174.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/taleruxurejutikinupadoku.pdfIn PDF document text
    • https://sakesushimn.com/userfiles/files/34364581445.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/86758127304.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/rexofejuf.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/77678722301.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/17715390548.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/fumidoxawi.pdfIn PDF document text
    • http://2safe4u.cz/UserFiles/File/4703252.pdfIn PDF document text
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/sisapogifabur.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/90366473095.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613116a4ab358---69830821697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=teju+cole+blind+spot+pdfPDF 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_off0000e13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 10684 bytes
SHA-256: a8ded0434c5f1501f8f46c4c8b59638b3f3d0fb989cf28c92a393d91d00c8491
font_01_sfnt_off0000f992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF992 18752 bytes
SHA-256: 58967ca19faf72012787af746a3a4989c8b6d9f792581c5b41096cf4b0cb6e24
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1