Malicious PDF — malware analysis report

Static analysis result for SHA-256 940e31eaecf7061a…

MALICIOUS

PDF

83.8 KB Created: 2021-07-28 10:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5d740a4accc1af765357698fb43f61ef SHA-1: a619f89afcb2844dab6a1d6ebadf3e4cc8712f19 SHA-256: 940e31eaecf7061afcc652b71df830ba19a72ed0b2e6ddb85d302e2e5ff3f6dc
156 Risk Score

Malware Insights

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

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, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/iuvte6ki7redihfg2hisf7lnh9/34021152523.pdf In PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741292c5e2f---gerobosexalanoselomugivu.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/34147435572.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/navolufukulegonim.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ceab31a6---6991949936.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/27636028172.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/70584307198.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kitumevanutipubotofutefow.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/piwobulimawivo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8d1478a958ee8240294e4e24a9687d0c/bowowevaboberokurodepon.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/0ba68c45c0d79a76c5af34abda791e63/komuzexo.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607635a961b95---deresijepirokojokarurekaz.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/xomezajujowodipebifajaje.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc5f0b7db6---xepemupelorator.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160780c13d077b---43830942972.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/muxejenabod.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/f8914eca26cfc398f9a72266e665803e/gizosimudagaseravewop.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c214ed4cda5---34475235423.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/ribivewowiduwedizibi.pdfIn PDF document text
    • http://hevolta.com/upload/file/modapum.pdfIn PDF document text
    • https://dacsanmyhuongbeti.com/app/webroot/files/images/pages/files/kigonifipuku.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/17872275560.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=roblox+free+robux+accounts+2017PDF link annotation
    • 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_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 16568 bytes
SHA-256: 684b06e5822c52742163332ed3e979752ea751ae9529d8dc76b529532d0c173a
font_02_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 10968 bytes
SHA-256: 53c19d1a651475193fbe8da273fd3e5b899a4623bd30ee846be2f945cc44793a

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