Malicious PDF — malware analysis report

Static analysis result for SHA-256 35dd8fa4525d041a…

MALICIOUS

PDF

90.1 KB Created: 2021-08-25 18:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f631f15b8bd2862696caa6724927d00d SHA-1: df6f8a532e7b74000e3866d7e81b48e0111e5a17 SHA-256: 35dd8fa4525d041a70a0bd3626543d467e95fefc513f9b106cdee099bbbfc964
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage trusted domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://genegurumiraclehealer.com/userfiles/file/26097219344.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7b5e4556e755878dcf6153f465ff4f67/zovudekafedorego.pdf
    • http://csavarkompresszor.hu/userfiles/file/75751163948.pdf
    • http://zenithmetals.com/files/96710298507.pdf
    • http://brightwayconsultancyservices.com/userfiles/file/19180507547.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855ab7c21c8---luxukekufebexi.pdf
    • https://senfina.top/uploads/files/misadufilelutozu.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/suvipepelagatodir.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771331b6102---rapomafasopuzox.pdf
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/simodazi.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name//files/sepunipowem.pdf
    • https://imotrading.com/images/userfiles/47247203421.pdf
    • https://thediamangroup.com/_images/files/vewubelonujig.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/fogebegomabikediruvupug.pdf
    • https://tecnicadovolante.com/images/file/25741232411.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/nuvozawu.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8847afb2---wereziril.pdf
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/70836243570.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/adc1a059ee9547e3e333d9ad2d110758/69597552764.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/a1e34cfbffceb6ca7854d67ed9f80e93/8085411901.pdf
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/98875554724.pdf
    • https://adikketiga.com/contents//files/pisapolesuzixutasev.pdf
    • http://bjaimama.com/data/upload/2021/06/file/202106250358594666.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1610e2c9b377b5---25615493058.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=copyright+free+colouring+pages
    • 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_off0000fbd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD5 16792 bytes
font_01_sfnt_off000113ec.bin
9834a9bd23bf4c171a6ecbeea31eb924237e6a940b20637f373f9fe7997424d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x113EC 11004 bytes
font_02_sfnt_off00012d84.bin
9f6b773675ec3e0bd429f618081e8b39c85acfe7fb2178cdf0ef399597b6a78d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D84 17212 bytes