Malicious PDF — malware analysis report

Static analysis result for SHA-256 28326c6dbacd29d4…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 17:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 037a2450ffd772528b3b7b6081a59ab8 SHA-1: b245f71f3d9544dc22e5b146b4df1cd2827bd867 SHA-256: 28326c6dbacd29d4d30093efc39d8688f178758c2fd3caa59b01e0ce20aacbc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to external URLs, some of which are hosted on compromised or disposable domains. The embedded URL `https://allytemp.ru/uplcv?utm_term=zombie+tsunami+mod+apk+unlock+all` is particularly suspicious, suggesting a lure for potentially unwanted software or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://allytemp.ru/uplcv?utm_term=zombie+tsunami+mod+apk+unlock+all PDF link annotation
    • http://yongchengtech.com/uploads/files/202109041415371220.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/pekubaka.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tawumosixenerebikegipoma.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/81958163996.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece79691b4---bemozelusosujosokalogun.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134dfae1e1d2---83194220822.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/26548248769.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/65258912112.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/46532008649.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131944c3a549---60218862390.pdfIn PDF document text
    • http://glassick.com/userfiles/file/bazesajes.pdfIn PDF document text
    • http://gibisch.biz/files/files/95775715469.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22336616684.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/tuleg.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/7e7f12136632cbae5930cb8e6627cd75/saforufarasukexe.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/xodisomumof.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/duribofux.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/jonazepoxovibedad.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/ditaxanujezefu.pdfIn PDF document text
    • http://garnizone.com/userfiles/file/63614120427.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/tuvirefil.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/24658830802.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/57663275437.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/77343450241.pdfIn PDF document text
    • 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 10872 bytes
SHA-256: 52fcfc2f24a3653760b1daf737034491aca8ae0ad21b863f9d9dc8ca122a0ce9
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10947 18820 bytes
SHA-256: 7515228f4b389b6965578eb8bca9c49f85b5840a5d9faa36857b9da033647e98

Open this report in the interactive analyzer, or submit your own file for analysis.