Malicious PDF — malware analysis report

Static analysis result for SHA-256 af39169983ea198e…

MALICIOUS

PDF

85.9 KB Created: 2021-08-15 23:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e16c76f735d2837d7009b73f0cbda2cf SHA-1: 0f4a1b68ccf03d84d652fe96a903922acbd5bb99 SHA-256: af39169983ea198e618e49f1792cc94f2682cc4b9265a112f15042dbdb1420b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, directing users to multiple external URLs hosted on various domains, many of which appear to be compromised WordPress sites. The presence of embedded JavaScript and the link farm structure strongly suggest an intent to deliver a secondary payload or redirect users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fae3104fbf---goneroxizale.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/a6382ca423a395fd797a74e92ef8e853/34801723531.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/56b2651d521c5d8d67cd264835a69420/dowexujop.pdf
    • https://servicepapik.ro/files/51608829573.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb555cf799---wonowijewisozufuruvoreda.pdf
    • http://schule.havonix.com/ckfinder/userfiles/files/tediremupo.pdf
    • http://seyrimerdin.com/userfiles/file/89083193305.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/62a5347e26b5eedde8c4146cc012792e/73833088581.pdf
    • http://strategie-online.net/catalogue_dynamique/file/66000092641.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/bb721aca2e530bd6745596f30eede5be/zupetineji.pdf
    • http://hiace-yoshikawa.com/js/upload/files/71225202827.pdf
    • http://qctc.vn/upload/files/jaxozedosagixozazewiluzas.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/timig.pdf
    • http://babywagen24.de/userfiles/file/pexefaf.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed45996fc2---22373231694.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/25746914a3a869f22513a177af039e4c/70489139937.pdf
    • http://asztalosweb.hu/userfiles/file/85686800875.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0695071---38330147875.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b81efc53dbd---93123513560.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/eed74ea5b197b7a0ccc515d8ddc50851/wasixogolitot.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/93048974895.pdf
    • http://farmaciafasolis.eu/userfiles/files/wikadewuzamigof.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a18f38d0c32---42125262068.pdf
    • http://esipro.fr/userfiles/file/84664612074.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dieta+cetog%C3%A9nica+tramos+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_off0000e517.bin
f729729631e2e62e956790641ac45fd4003a6ba059246dbbd332d686748ae63b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE517 18860 bytes
font_01_sfnt_off0001152f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 16792 bytes
font_02_sfnt_off00012d46.bin
a35998b58d6485a6a783d6f7a403d9f7be15b557a25e17c79cd05700165deefd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D46 11072 bytes