Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe062d404fb64a6…

MALICIOUS

PDF

87.5 KB Created: 2021-08-02 08:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c6406d7251ba2c2f6cc96dc788039a2 SHA-1: 144b49c58b31c87f0af99c1161953c537883d2c3 SHA-256: 7fe062d404fb64a61f814c3878b94968deb7c2db89a9ae5fa2d7ce3d7ea75675
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/40388579119.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/vodirafifal.pdf
    • http://salonorganica.ru/upload/files/kiter.pdf
    • https://macauroommate.com/ckfinder/userfiles/files/92339176255.pdf
    • http://owv-sad.de/userfiles/files/90239217662.pdf
    • http://polyalpan.hu/_user/file/dabomosixegoloku.pdf
    • https://vannordenvastgoed.nl/userfiles/file/30099697399.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/9782ddf4a75f6453a97e04fa15ed7694/vutikagijovoris.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50cc7a0de---35804964460.pdf
    • http://hnsunnyfood.com/d/files/36818434616.pdf
    • http://potlista.com/file/files/fazunadajosaxulur.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d771026cc4d78b6d5e4b37b49e280481/kesakilexap.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a834f99b98a---61257910996.pdf
    • http://campfirewtx.org/userfiles/file/37843230454.pdf
    • http://savages.lu/imagesRTE/files/vazibide.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/20662062636.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd63fadbc3---66196958710.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0bffb027a---13974921672.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160888f5c1ef0b---65023446354.pdf
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/tibitibexaxojefibuxis.pdf
    • http://nguyenquangcomputer.com/upload/ck/files/34345367394.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=german+grammar+exercises+for+beginners+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f082.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 16792 bytes
font_01_sfnt_off00010894.bin
1d26b5dbddc2a0962738f3df53b35f9687aeba25874c2ae973033e56f1044b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10894 16388 bytes
font_02_sfnt_off00013306.bin
c238210b4671580ff79431aaba18c34f1c5fa2becf1030ca0fd15b73a751fd37
pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 11232 bytes