Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd24b95039c73263…

MALICIOUS

PDF

84.7 KB Created: 2021-07-01 18:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 458f2382e457f28d0503897c4b92a44b SHA-1: e17272a6fbc5eccfe4611b8249f0653ffbcfb894 SHA-256: dd24b95039c73263448aec412225d5174523fb9ed83f10f6f1bc477e86dc9479
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a social engineering lure to trick users into installing browser extensions or updates. While no scripts were directly extracted, the nature of the lure and the presence of numerous external links suggest an attempt to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d870105bfb180ce6b26768c12cb0e83d/defasa.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/447feb41d9fcc08cfb8493736fd01fea/39348903714.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a2be2ed6e187053f9897ee80d8d36b3b/jegareba.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/45042338e6eca24f21d9310ba7f58cfd/51210798967.pdf
    • http://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/nanojikejinege.pdf
    • http://marathon-gexin.com/Uploadfiles/files/34018937929.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2689d0ccb---lubipeluwomuz.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd5c372a2---jisozi.pdf
    • http://fence-alarm.com/userfiles/files/96173054206.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/buradomilewupot.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/m3aohiosgtmp0omv3hma19lr96/67448952390.pdf
    • https://angkorphotographyguide.com/userfiles/file/21865995814.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ed9d0077a1708d4064106c22350e135e/pixiwepunidozugovu.pdf
    • http://absolutelyneon.com/userfiles/file/95002891342.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/1fjoh1kflog76hojino1jn39ra/sovazuruto.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607154d9bf673---tomilepoweruwerowur.pdf
    • http://agroanaliz.by/upload/editor/files/99023667218.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d51bbb3850f39d0782d8d6724605ade9/75130357006.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc0b1c75af---78441431210.pdf
    • http://www.contectrade.hu/fckfiles/file/dukefulotiludoxivo.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/aba988bcef0018b00640f0972bb89754/xojijufoxikasarulosugilog.pdf
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f2434ff62e2ee94012d3f3b7d8664f70/zezenagobixapadobetixezup.pdf
    • https://clumba-indoor.ru/files/files/80029420634.pdf
    • https://heritagecambodiatravel.com/userfiles/file/tolifezijigabara.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=find+someone+fast
    • 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_off0000e759.bin
b6a4d51fcf234089956d43e9893b3baaeabd0c229275a1a2c4814677d4d082e5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 10344 bytes
font_01_sfnt_off0000feaa.bin
baa1383bf4bced363a590eef299fd896d8d30ed26e84efb62780de0eaa9368ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 17964 bytes
font_02_sfnt_off00012df1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF1 16792 bytes