Malicious PDF — malware analysis report

Static analysis result for SHA-256 572f5814f185382a…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 09:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2ee045d6a790b8d66e95d15809096b4 SHA-1: 9011cb99c55f091aa562785c6fb3d89aec78d9e5 SHA-256: 572f5814f185382a42971e6c3675fd5609724b09fbf1abeb924abda132f55e63
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. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://jl-vacuum.com/upload/files/21735622465.pdf In PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5b789d1f---zujukilon.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/70920637676.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/danilata.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a477f48e2c---vinowuvafesapozuxipanaxon.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///lakeravofo.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/54628568604.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c9f8bee53---raxuxowalowapimukoga.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccb134c61d---95332827195.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92097521812.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/b1oqmocgcm3p63nd5as87dvnrp/kokizijagusor.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/21718810579.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079f05b01843---lajasamek.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085088a7b683---24453772222.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/bubek.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/43653424361.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b596567050---vugiwitotufidufov.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f72d8bbe38f---zamipipogu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161192f8c0365f---44843344815.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/o03q2innl32l421o1b5rbt4lpo/90927289951.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085caf491b08---6987101037.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f39fc59fac146fe45a7832c2f9d42b6a/tipoxekedojilubabibod.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/32478570056.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/97493106063.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=apresenta%C3%A7%C3%A3o+da+empresa+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC36 24052 bytes
SHA-256: bc98dfebc6c2528da2a419dbbd9968c09bb2126a97ebc8236c282bf02a37d325
font_01_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 16568 bytes
SHA-256: 7141ee9561829729a817ed55d39eb38f4690f86230476e9e9743726c87f0f76a
font_03_sfnt_off0001258f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258F 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_04_sfnt_off00012ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA8 10968 bytes
SHA-256: 17d17377dc6e49aaf520f0073688e69a9783018a886a699b7993ec5475a3aa5a

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