Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5e9a541ea70c37…

MALICIOUS

PDF

122.2 KB Created: 2021-07-17 23:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80b923068eab10cf2d5e692d48b589d8 SHA-1: 9ab6eb0c2087854850c6a30eb3fbf38c4ef16e9b SHA-256: ef5e9a541ea70c377717b616f47524949069fe5ee0a773fa058d3f05d54676fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure that attempts to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ristoranteibucanieri.it/userfiles/files/vilowinuje.pdf In PDF document text
    • http://papianiarch.it/userfiles/files/netefuzodofaxumadumuleri.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4d6cc283b---36573356363.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/111d16f58aa03beba46c175827fb47f1/dozujulepe.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/nunefodoju.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/8r66f56bad63an7ufpqrde1u81/lopiwizokovadavug.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd284a94185---78924200037.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/41565495665.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5201c42bc---vifitigomoviw.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607522153617d---fipabuvasuzafonefavapibeg.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/013b065bd23e64ec97cfe5334c8f6a19/69674780512.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ecc6a3ae5596b93cf73c752ce885cf23/10375872378.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/85870055587.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb87192fa32---xigetulugowosugilenewite.pdfIn PDF document text
    • http://geasit.it/userfiles/files/229168476.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fdpqhgvmpvchh7n3vql92bkjg1/37249524646.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/gejetenepomumojedorutipa.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc55b75694---kejamakogitememuludekezu.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/vowegejegefofudo.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0567eae3---40826702934.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8e79e739---4394333431.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/546976f865d1c4a807c49dd0bfddaacf/1723324381.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=2010+g37+coupePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016d96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D96 3676 bytes
SHA-256: c458fec528dbb54516ccc97135b1c8c862e91814c92d220ffd5ef1668e8598fc
font_01_sfnt_off00017c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C33 10296 bytes
SHA-256: 86f09131db2127b75615603ec661cccf857bc0502e97b822a85af5eaaf0e05cc
font_02_sfnt_off000193a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x193A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001abb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABB5 18100 bytes
SHA-256: 64e860d56cf8217b2cb0dfa3f6415f21c5e8efdcbdead9f87a4ea3450c4bd944

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