Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a08e49eb454410b…

MALICIOUS

PDF

131.8 KB Created: 2021-09-23 04:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88dc60edf86609506a14cae0e0ffbbd3 SHA-1: 11ae47744039e5c9bdc1c8ebb0f952584a14360b SHA-256: 0a08e49eb454410b4022cfc610331cd9f88ebd45b5039aa9e6ce1018e0d0d36e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous links, many pointing to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • 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://villa-margherita.biz/userfiles/files/vuzosam.pdf
    • https://kocarbonag.com/luutru/files/1365319614.pdf
    • http://print-printonline.com/ckfinder/userfiles/files/sisovogepebijadenuv.pdf
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/64340317078.pdf
    • http://orthopediedelft.eu/files/34241882099.pdf
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/sobameb.pdf
    • https://naucharts.com/ckfinder/userfiles/files/pometopajavetoterut.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c94aa540fea3e0af7b5849c7566f1d88/jupob.pdf
    • https://coop-alternatives.fr/images/images/67317406677.pdf
    • http://everestlodgelukla.com/userfiles/file/tizogigevitexivawu.pdf
    • http://aorganboys.handyfriendship.com/upload/files/puwubekosuwatowoxurided.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bafa8475b2---pimikiforomulu.pdf
    • http://platcometals.com/images/file/66713739680.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d962a0ca81---vefodenonidazofexofiwo.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0defec4f10791a3ad65ddeb107376021/zipabovuvaw.pdf
    • http://liavanhaeringen.nl/userfiles/files/64783550914.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc383b990---18062709925.pdf
    • https://gtselect.fr/ckfinder/userfiles/files/guzuzukikafopo.pdf
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/ruvapaga.pdf
    • https://gencshow.com/upload/ckfinder/files/40578522854.pdf
    • http://alphasigmaoverseas.com/userfiles/file/22819667490.pdf
    • http://aromata.ru/upload/files/bijolibizanasupepixosev.pdf
    • http://www.rannatennis.ee/data/upfiles/files/vufiv.pdf
    • https://njshore.drinkpoint.com/uploads/files/dejaberadufune.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c52d2988f3ddaf34ae2aacc651e1429c/89437541193.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=nightshade+pdf+alex+rider
    • 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_off00019fc1.bin
ae6bab35cbd69eabd21b0ad41e57d1c07d401d07f9d6b99b5ec207e1c503826d
pdf-font-stream PDF embedded font (sfnt) at offset 0x19FC1 19248 bytes
font_01_sfnt_off0001d157.bin
70dfd5ac448b6db0ca7a3f7f5fdbcc5b3bc1d2214add5f126ff661ba5dff4787
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D157 10632 bytes
font_02_sfnt_off0001e999.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E999 16792 bytes