Malicious PDF — malware analysis report

Static analysis result for SHA-256 0669f550af458375…

MALICIOUS

PDF

90.6 KB Created: 2021-10-18 02:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c3bfea477ecc27cb575631b6cd308b3 SHA-1: ec24abe62fc0fa27f3e468cbac783a757503b829 SHA-256: 0669f550af458375c3f2994a8c20bf01b8f0469fb6738aa50e7929af251011cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to compromised CMS upload storage and disposable hosting, with URLs containing "utm_term=aptitude+test+pdf+with+answers", suggesting a phishing or social engineering lure. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=aptitude+test+pdf+with+answers PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7f3eb520---wodesaworutum.pdfIn PDF document text
    • https://spacio.hk/attachment/file/niwebe.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pavusetekuf.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/visoduxotufupavebaf.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/fuwipimavuvoxure.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/2233683409.pdfIn PDF document text
    • http://cci.dboem.com/js/upload/ckfinder/files/samewu.pdfIn PDF document text
    • http://prosquash.by/data/11031287068.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/66744026833.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/70030591865.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/nosifonerinoxabovizas.pdfIn PDF document text
    • http://zmz72.ru/files/file/sedutivafiwina.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/39097927060.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/40454544132.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/nasuv.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16167eec4a4e49---15047311479.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/kixokonoguludubo.pdfIn PDF document text
    • https://atiksigorta.com/files/mowonobebosuxelov.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/xuzekokadaxi.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/danedigat.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/efd29aa4b40a52ab4b58eda062feaca5/firitovenaremowazujomimoz.pdfIn PDF document text
    • http://clubblink.net/admin/upload/file/zeliradizazenekudeza.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4212640944.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off0001163b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163B 17948 bytes
SHA-256: 0ffe5021881dbcbf152e0e971e97f2819eca0638fc51e691124d56d4ca627701
font_03_sfnt_off00014410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14410 10596 bytes
SHA-256: 80ec3910d82bf2ad98272521aabe3aae297212a2e8385f3d80052633c4949d68

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