Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d1109360dc82b41…

MALICIOUS

PDF

70.2 KB Created: 2021-09-02 13:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d83c8975d7907b125e1e4cbdf7494780 SHA-1: e7432113fb34a88ce1ba7fd9c3907e991c4c969c SHA-256: 5d1109360dc82b412842c4de8a30b349a733ca1be6a37ea1223908732a09c12e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/eh8rafrdqe3n2l7fel7off8nh5/16681598594.pdf In PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160af8667909b2---50016956844.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ba0b90b5f2---74208382851.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1b2af1f7c24cd5612b47b5260ff54968/54665420337.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/9991296106.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/wabefulilowijipimuti.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/lisazazisok.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/7e89d1ced2d7b12798e9a21af5716195/91472431393.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/0f81d32358629efb3fd7967b7a1d697e/88353300118.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/11306497478.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a5510f46d3f9d74d1e98ffb6214c2b6a/tadolafufanatosa.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/xuvobelab.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/92642301665.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/35589208538.pdfIn PDF document text
    • https://lymfologi.se/anvandarbilder/221/files/945744669.pdfIn PDF document text
    • https://castel.ro/userfiles/file/53465493916.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/felijavazomavekewiwejur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117b5f49d3f4---lulesubajos.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9ebi5em9tl7462nup8425gbj33/74124286245.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a1e2fa0a5bd23613307db8349507e460/wafizikavad.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/95fcb47b2b685bb2bc208dc6be1e9b4c/18511933875.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/govotodowevusegutukomakur.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e69b440e---26837099732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=patrones+de+dise%C3%B1o+aplicados+a+java+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_off0000b223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3A 11016 bytes
SHA-256: 3f6bec30550ca429c010a9a3b1910dd52343aebbbc32b780751344a1ff049ccd
font_02_sfnt_off0000e3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B8 15156 bytes
SHA-256: 0a09a1ba4f146fb9e7972c6098d70f9c2b8a6ff90e19d6f593df442a4a09052a

Open this report in the interactive analyzer, or submit your own file for analysis.