Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5580dfaa6d90dfb…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 08:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f9da61d53ba17ba3b8d349fc2e5e1318 SHA-1: b3703095f584d7b15309e9e1269b8d4c163ba3d0 SHA-256: f5580dfaa6d90dfb39c9e362a6669f92a6c2558d2c2a7f1a2f5e5a0120f8d236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://oniceh.ru/uplcv?utm_term=child+support+obligation+worksheet+utah PDF link annotation
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/2ecd4381bef2c0a53a8f7045ad29e849/rofazebivu.pdfIn PDF document text
    • http://jar-ted.pl/file/61439232754.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608708aa3ba2f---58484467779.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/21fec6748fe161024ec3260c6895c16a/68723170141.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/gaxadozelakajugalobo.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/16061726486.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/28580211527.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160816fd76cbd8---muwugitinuzor.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gagom.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/8b426e5ae5e9abcdea0756b28df43917/12573446263.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/1552907527.pdfIn PDF document text
    • https://naves.cz/res/file/katikimuwal.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e2d66ce08e0b8456a9c2702f31b1c44d/16966913225.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/vv67s6no4gc4e0euh0u073esv5/vixutapowelizorupovul.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/jezorabig.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/62534512599.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/56422836059.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/19276123221.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/11108497534.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/pazepojoregigalupusudi.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ho0fagchrlcs3of79r2t3ci01n/pirovomakiranijisobitu.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/96236457815.pdfIn PDF document text
    • http://whatcanidoforyou.eu/publish/file/26999048158.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bcc5c64395d---24643654266.pdfIn PDF document text
    • http://z500.si/files/ruwagixofugamuwajexute.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/jifagiso.pdfIn PDF document text
    • https://bem-sa.com/img/file/sagomekefikatetaxexefiwa.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_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 11120 bytes
SHA-256: 575dc887237525a6963a1cb41cde77f6dbd3eef57167d5068cdd5aa52a6d4ac9
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 17236 bytes
SHA-256: e4f5d259e53248318ccf5df04ae300ca1004e94ad5fe07f8106e993d7d73f53f
font_02_sfnt_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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