Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b77361e413dd164…

MALICIOUS

PDF

86.5 KB Created: 2021-06-25 22:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d3c9dbc8824cdb7114510ef740b015c SHA-1: f9ab4c4b14c277b0e87fc8af7b8a27e85e17f102 SHA-256: 5b77361e413dd16467e4a9496c91abe0d9aad227caddd03244e14a0e4d2dc0d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of multiple distinct hosts and the use of disposable hosting further support its role in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2232ccfafd051020adc82da919c18ead/dewujimub.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0aff7543a49695210a7ff0e0a15987ed/warer.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ng3bct2vkt0q99umgh9cgk3gn6/fulamesadiporosuw.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/096f674770620e675d4c72ac574b036f/67125335728.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfe9fb7a1c---43368628450.pdf
    • http://www.klimavill.com//data/editorfile/30939712250.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609018b68c224---bopelozisobal.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722126cfd9d---pepojuvirawimovasovomi.pdf
    • https://rivnerun.club/images/files/wegixilejuri.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bc02743465b---kabovanubaxagiso.pdf
    • http://greenplanetnepal.com/userfiles/file/fojog.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/vg9iqfa1cg9p1tgn52tms1hlsi/28997044690.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/n7r7oilkk6ibvs3r1vooj4gjd2/97886604636.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cfdae635bdffc18cf896888e88e64377/buxobefezuzeru.pdf
    • https://fonixkoncert.hu/upload/file/86574686818.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a33c3dee0b6---vokizaverurer.pdf
    • http://aggengr.com/uploads/CMS/file/71063454188.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fkcricmc5ofsslloa0ss1l8n92/99068565283.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/0llmc34d96gm8m7qjrgc2jud1c/kinuteko.pdf
    • http://pension-erlkoenig.de/img/editor/file/6144065322.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7cc9b6e9c---2778258910.pdf
    • https://liniagdanskzydowo.pl/files/42742257331.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/5097b6a1df6cd8e19ab109763cc7b46f/fabobef.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f930160a2---26972260270.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/wovizumebafejuzuxozi.pdf
    • http://ekotronic.eu/files/file/26387495894.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a363ef0a31d---vekenizok.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=amber+urine+meaning
    • 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_off0000f088.bin
658a1e28a52da59732151e680a37f33d1ebe216db7fad34e61a44a83466ff916		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 10240 bytes
font_01_sfnt_off00010772.bin
4401d73de8e5f5e67629382c6643a3f190ebd61717f7f48dd9374e7ed45f0c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10772 17288 bytes
font_02_sfnt_off00013499.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes

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