Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d44f8c9b9e80f20…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 04:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b1a953c2250a3aa56f965118e10e240 SHA-1: 245ec7d97ff575292c2d0470ecfa95a647b4ac51 SHA-256: 5d44f8c9b9e80f20d369b3c0f1ab9fdbc791bbae1647e766879059fd66fee6c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ms-domino.eu/images/file/files/33460328466.pdf In PDF document text
    • https://shreenatharcade.com/userfiles/file/zexokepeno.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/rimowixaxovizizazevuw.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/72354069669.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///14269225809.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/17447083904.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/50412156394.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021091011453473499.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/xumuzesimaremomi.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e80ed58b6---92723863318.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/xuxowedadisixalasugezoxi.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/12j49ed435po4ahnbvsd1ueds3/xemobetorilorazavov.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/1810446423.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/79678161945.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/69414046835.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/81773682889.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9292a2311---33198344807.pdfIn PDF document text
    • https://j26clean.com/upload/files/ratemoxuzaxef.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/nojas.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/mawivip.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210902232149.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/20167766274.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130748ae1318---4065131322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pink+panther+sheet+music+free+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_off0000ce5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5C 10912 bytes
SHA-256: dcc85bfd771c5cd94e8f00ee23084a5e47950ec5a588fbce978c23039e97f504
font_01_sfnt_off0000e77a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 18396 bytes
SHA-256: 3c40f8efa48e464257b440947e59f298557e3b1016e7c872299ea20b0f0535fc

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