Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc050caa3a7b7e15…

MALICIOUS

PDF

87.4 KB Created: 2021-06-27 22:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a623cec296f3e472d0f052610fe0c0d6 SHA-1: feabbfeef2f746bbd369b050b611e08191b5f308 SHA-256: dc050caa3a7b7e15d4ffcfcc7a158e7fcca7b83add1bd65c64d7dadd31f2b1b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the presence of external URIs and the link farm structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://kcde.kr/userfiles/file/banubujivenakodefudixezo.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b125163---64443527109.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d5651fbac---lolamizuletarijakejosok.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4062c8f5c44c52a61cbb302019f81555/disujajuzutixoxevifezebiv.pdf
    • http://bogelaipigeon.com/upload/file/pirimogivuropaxujevas.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607868308e0b1---19316219644.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ca1d0cfee---wamut.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4a8949f05---fesowatumolugo.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/fa84c88ed4207f86e2f018014d40d30b/97381405643.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fmhirembcq5mtkqm53e66btd7v/vijugugitegub.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a36c7d9313d---4616677622.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/3db1f16b7ab7ae94eb867cc0408ec379/16229988583.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8a1361f42543d1d775c7078d2992304e/xarakipokadirizile.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/674c908f30af64a17ac684a397d13e2f/39162956921.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080dee93ba9f---28610154140.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/paxotip.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895d3ca9c2b---64904876844.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/dte10pbr49oai94mdentbq547d/84975672712.pdf
    • http://studiogiovannone.com/userfiles/files/75764371124.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e86be85071---64659183741.pdf
    • http://geombiagioschettino.eu/userfiles/files/43421464829.pdf
    • http://inse.us/uploads/images//files/8792346319.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/j7jvuhqqd40q5ujthgjbcm2lg7/57119171915.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339177587549cc3e4a6a94b984b2a692/80742650185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=apk+of+minecraft+for+pc
    • 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_off0000f1e7.bin
2298259c077f62c6974ed14754b126ea3283cef7b849d4071330a6e531bae203
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 17232 bytes
font_01_sfnt_off00011f04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 16792 bytes
font_02_sfnt_off0001371b.bin
baa4b8da3fca2b6d630b86605364a6a2d03a2960e50f1c1b8546a0325bb94f43
pdf-font-stream PDF embedded font (sfnt) at offset 0x1371B 10500 bytes