Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d61bec9d9a18f4…

MALICIOUS

PDF

100.6 KB Created: 2021-08-12 12:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2beb1b8caf3b2d3872cd299329df61cf SHA-1: d06e8306993dab3672706ac003afd75891b2f3f0 SHA-256: f4d61bec9d9a18f407ece70e4fafffd49db77ea4b2a9fe56cd3b89a3e705a589
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users, likely for phishing or malware distribution. ClamAV and ML classifiers confirm its malicious nature, specifically flagging it as a phishing trojan.

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 http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890d6dac720---54076256831.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2472bbc257---damuwaxofoj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc1351018b---lasexajijemikavotelaf.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/giwumejikapemux.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/femonipavox.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/33379909943.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6265d3d4f6---mofevaremevasoza.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vusupokixegusita.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/329ef2b9b5bd0f0c93bf2d949ecb90ed/zoliwugeloxab.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1lce6qstj5u8l21ogvjk7f6292/zupiroriduxelonapi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/xejafokivaru.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/71269280919.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/narumefik.pdfIn PDF document text
    • https://sanidom.pl/img/file/dasekonusofulomizot.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/95abe4da3763d1bb0de353e00011768d/nelowajutana.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/b321687ecdb5134d9ee1c1e5815bf3dc/bexexiv.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/78452303910.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/40942976984.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litefaxunupasobefilo.pdfIn PDF document text
    • https://ms01bet.net/contents//files/17906611221.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/kosawemozi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082feedeef3c---mazixikidafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=introdu%C3%A7%C3%A3o+a+sociologia+da+educa%C3%A7%C3%A3o+persio+santos+de+oliveira+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_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C7 11376 bytes
SHA-256: d15a993d2e9c84bdfc29747ef21f7c1bc9cdf7ab68477ebd12d8491275f3ba66
font_02_sfnt_off000150d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D2 19436 bytes
SHA-256: dc27ce20ec7e4f0643bab25320f3486fdc8f14c3b32d28fc6af5b225ee5c854e

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