Malicious PDF — malware analysis report

Static analysis result for SHA-256 5965c28b4eb3a465…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 14:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ea0061f3a5d18133daecc3ae2bd4993 SHA-1: fda0eaaf1430f753395a93b9a6026edf0efa9113 SHA-256: 5965c28b4eb3a465a810db7a9f7e52ab3b56950f32f0b95f8a43aa8c089b6efa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to compromised WordPress upload directories and other potentially untrusted hosting. The primary purpose appears to be directing users to external, potentially malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160766b5dccd7b---beninojadaju.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/e6emp1iilm2le7fm7neansem4k/95649073854.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ecd9be870---kanibizilutuwuvipenusa.pdfIn PDF document text
    • http://envigest.cz/upload/file/41195956020.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/51621824800.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/be59d0f3ca36e6e0925cdf9698ea67db/pexafosuginusi.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b00686862---65962149829.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/nopejizewiwixomamerutix.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/159a8c9854c0e68781fdd3e225b5b3d0/67070396303.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d03be56704---19602837316.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/5222112fb9d4e8c1dde9f5b3d85c1443/11128981503.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f1bd121b1---55577400683.pdfIn PDF document text
    • https://ms02bet.com/contents//files/vukuve.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb32e72698---tevaxemutetud.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/35129389978.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d327c6eee2---zirejabuloti.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2999043c6f414455d494dc66d4088a57/guxijofuzur.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16088389f9f0a7---bisulip.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/110bac4375f901fca65ae6b1783c3469/5220023072.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f9774a11f06895b54de9e0827e301c34/sakevofesirudamesitupo.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/89558140163.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/7595077641.pdfIn PDF document text
    • http://uci.ir/userfiles/file/66816957816.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/25ef33e6da9fdf39b0df85e71b096692/piwigaxeke.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/737a296a09813f64c0dd790efeedd57d/78651656731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=will+cheese+constipate+youPDF link annotation
    • https://medlineplus.gov/constipation.htmlIn PDF document text
    • 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_off0000ebf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF8 10580 bytes
SHA-256: a623cfc073b7fec2d1a0e2ad10fcd914fb9558b9bd00af1ed0c7bc0574618dbd
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16632 bytes
SHA-256: c0131d37e9e9ab6df6479ad2d63d28488e863bbc3c838742140c9d7e497f710c
font_02_sfnt_off00012f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1