Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa83f177113a390…

MALICIOUS

PDF

74.0 KB Created: 2021-09-07 09:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dfb83cf24d60b5c5e9fa27a08d3d08e7 SHA-1: c2c0da1a009bff5ef9fcf1bc28d11d5c204bba0e SHA-256: aaa83f177113a390d98efa76907e1894c8368b5878afddf32f1ca07bae2b2376
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lure users to external malicious sites.

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://braghieriarchitettura.com/userfiles/files/bumadezo.pdf In PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/32bk2iqlan3surkdbq8ud1ei4b/30497171241.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/kepopoguxalusilemopujona.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608334c8db6a1---dobivusuru.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/30190681827.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/18183d0a6ce4c478d5e96461b6e23337/79409984539.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080730d3077c---21866444203.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a15c8b3bdb---43098230691.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5aa9c92569f3d1a50eb09388fe755749/65519774285.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078e40a2bf53---1660080753.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/6090237207.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba8d1cd69---lexin.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/4223327303.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/56135935808.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/baac01ba69067526a2b0eec81d71c5bb/vopazeguwesixajovazede.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/24359158361.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/33983261941.pdfIn PDF document text
    • https://taperagi.com/contents//files/62409281789.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/89695845297.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/32431050303.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/91540675880.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/47886515462.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609494170fda8---juwugewejutowisafaj.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/judefakududuxozaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=wind+turbine+design+handbook+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_off0000bf9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF9F 15584 bytes
SHA-256: 84e8b88518f644bf4d023b6256f0a6fb402b4786767670b44ff30af1044c5512
font_01_sfnt_off0000e6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11056 bytes
SHA-256: e25c2b817ea7708961d46b342fe3c9d00a084ee5a71ad25317fbd58eaac3748b