Malicious PDF — malware analysis report

Static analysis result for SHA-256 14bd6b468e38e913…

MALICIOUS

PDF

88.2 KB Created: 2021-09-07 12:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99a0871d22a1a3d4717a2d477a2702ed SHA-1: 4e17dcdf78b5e3f247d2f59afbbf7cd38c1794fa SHA-256: 14bd6b468e38e91358fb0ec4755f498b3a0dd26e208e6af1a16fffa63db74855
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=manual+bike+pump
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/71622320487.pdf
    • http://datong-travel.tw/upload/ckeditor/files/20210811180413.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb962004d---34814786235.pdf
    • http://parbatsamajjapan.com/img/files/files/gofapezutulonusemovowe.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/3888fe2083ace56fdf27ee7509520df1/40579534432.pdf
    • http://tostonet.cl/ckfinder/userfiles/files/nuvaj.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/zivizofovavagefo.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160756e9b84876---4009236727.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609655a6c5bba---56153035004.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa289eff3.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f891ea38148---madazaziwamenamu.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/xadafem.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/norevosuta.pdf
    • http://ty-universe.com/image/files/20210703_004141.pdf
    • http://meskerjager.nl/media/files/15685867483.pdf
    • http://cableesmaltado.com/d/files/51607129910.pdf
    • http://klawiatury-foliowe.pl/_data/file/95192836589.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1d4d0aa55---80790137169.pdf
    • http://galluccifaibano.com/userfiles/file/44200123649.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de676e9983---99373581224.pdf
    • http://boschvietnam.vn/files/usersfiles/files/72145593069.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/u1k3693qp27jqt772bvfkfdtq1/bedinagilokasakure.pdf
    • http://petra-dario.info/upload/datoteke/59621246138.pdf
    • http://sam-global.info/files/file/35501209919.pdf
    • https://aglogistics-bo.net/userfiles/file/nuvasigevaze.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a7.bin
6453a1e2cdacce1bac6e8b3204c344ee0720c25b9a86ecc125388ecf2fde089f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A7 10252 bytes
font_01_sfnt_off00010c4e.bin
ce4a0154361342e8c77671368dbadafd3876faaa30b7c2d75cda36b6b77cf337
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 18056 bytes
font_02_sfnt_off00013af3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF3 16792 bytes