Malicious PDF — malware analysis report

Static analysis result for SHA-256 804410bc743cf3ab…

MALICIOUS

PDF

94.9 KB Created: 2021-09-18 11:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f987e024c6b8abb97efeba616b362a9b SHA-1: ec09385f2872d57833aa79805b3fb387a4632b3d SHA-256: 804410bc743cf3ab24833e165a104ef8c44feb3e7c5eb23cc78c5c0581aa3545
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identify it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisamemezi.pdf In PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jukegakiref.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nimavafapixijomukegevini.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/21223233778.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/sagirawisuri.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/zesuxoxizugizazigugesowe.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/roxisuteguwamibebutuwaw.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de14cb289c---ladeva.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/zamafetowumix.pdfIn PDF document text
    • http://only-svet.ru/upload/files/zimogajetuwodatujukubud.pdfIn PDF document text
    • http://schokobrunnen.com/idata/84464086792.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/finitijarejaresorixosuzi.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/40526849763.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/21159789447.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/mejuzafoxurolelozasog.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/nipulafuzovigixewaboxu.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/sobotivevewivurigure.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2533e695ce68c40026061bed6a77c112/62077813265.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/59151370678.pdfIn PDF document text
    • http://baoveantam.org/upload/files/41868684091.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161447b061581b---2371794940.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091607013793.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/lopojojojiwidusekug.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/watuziron.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/48329458508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hello+world+using+android+studioPDF 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_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 18472 bytes
SHA-256: 6b3fc91b785002d0f490abf5c03b3e035593b578f0277041c1f5fd47233e25bc
font_01_sfnt_off00013d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D62 10600 bytes
SHA-256: 49b406ae6820faaf868c8ecb06878c22350413478ff0d4f950eae943d6bf6c36
font_02_sfnt_off00015585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1