Malicious PDF — malware analysis report

Static analysis result for SHA-256 527e90910b1b9db8…

MALICIOUS

PDF

79.3 KB Created: 2021-08-22 10:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 429e3103df7b52f5f34c2793ae4d19bc SHA-1: 9f93252f684c3c3df748e02b4cf9926b369b758e SHA-256: 527e90910b1b9db809d7f1fcb5f3b11ee7626ab9e3335b3e52142a691b9ec79d
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 0.9989

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://chcial.ru/uplcv?utm_term=gitman+lawrence+%282006%29.+administraci%C3%B3n+financiera+b%C3%A1sica.+prentice+hall PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608510f69cb0f---81290977258.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/72780ec574ee90f368de7278eec5885d/xodesex.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/58733208994.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db997c381---josuwanexowu.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/5665959302.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/kilirowe.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/mifovibe.pdfIn PDF document text
    • http://strandedtattoo.net/file/20818542203.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/r5vrpd3osf9japegau24919p9g/21146672389.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/91209646069.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/683d6f68d95388537fa483a4b6e3d59d/47797292663.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/39591915232.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/c64hl816sja1risp6f6nq4mohh/22424262542.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dabc4486d---57315864336.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mvg1cc2frgmofoj0mfdeqtpolsschedd/25786054283.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/felet.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/6660856094.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/49c8bd69c540b8a48ea77e59daa8a551/toxepisidivejobufegesudi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fe6844ee---bivojepuxogonowetimojelig.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/gotinutigat.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/xijosoziredejogune.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/29815294663.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6616acd7af949ede08402fdcec202d91/47645246093.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/47433547508.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/8d6vit3l79pgc29gml33m3pnfg/bunola.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_off0000c980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC980 17600 bytes
SHA-256: b225b1ac21df74903af52e3f06169fb81f8fd366907bdc7ff5f2fe7a53ccf714
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 11980 bytes
SHA-256: 06ab112a844f06fb4904fb57a90fc928cbf5bc50766d175029250eeb3a0ff36c
font_02_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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