Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d729b7ecb632cee…

MALICIOUS

PDF

91.7 KB Created: 2021-08-12 23:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 656b4854b761eeb15868eed0517f3f90 SHA-1: 0557b3ef4db94c4223ce9ac52e5d66d7638e3beb SHA-256: 2d729b7ecb632cee5b09ddcba0711b424ae14ea06ecf0687ffffc11c5a2a9d9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads, indicating a likely phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript is likely used to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea23705ff8---59459737121.pdf
    • https://doctorchina168.com/upload/files/14026659619.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746883601c2---pabikux.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/9a6799ecf82719430b981d1ae06dd0c0/14720433749.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/aone9otetv9vogoua3njd5vml8/48725581550.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbfe10959f---13886495649.pdf
    • https://aneri12.eu/res/file/sudasuwirikoruluxagez.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc5fa74b1b---28182735211.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882bceb4569---47056356693.pdf
    • http://anaminfo.com/attachfile/file/zolekotirulusibuzomuf.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607660a04d54e---29820348901.pdf
    • http://emusicmarket.com/upfile/board/files/23333768431.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/020d5ccaf27af08de9a4c5778d8c15fe/jiwosikutozukibeda.pdf
    • http://gamjagolla.com/uploads/files/vibitosel.pdf
    • https://studiovizia.com/webroot/img/content/files/32926550869.pdf
    • http://anchor-m.com/js/upload/files/gexapideketijodenaze.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086de2a6e4e6---83881161890.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fiir647bcs50hb6vk9das6ssfn/nepibezom.pdf
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/72664158974.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/22b23d3f643c5af6e37db2af168c4fb0/zajagef.pdf
    • https://europawindow.com/app/webroot/img/main_content/files/22056338958.pdf
    • https://bravo-hk.com/userfiles/file/51105142105.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1591533625caf7c9599fedcc05547ce4/11125498312.pdf
    • https://sheenabusesandcoaches.com/userfiles/file/vopurisavuwaxatoro.pdf
    • http://bagiez.com/userfiles/file/zobujowef.pdf
    • http://anupbolivia.com/images/files/lubatogunija.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=witcher+3+beginners+guide+pdf+free
    • 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_off0001005a.bin
a15692d44c19cd4e39aa48a711b883d78755a027c8721a1fb9edbe411edfee1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 17672 bytes
font_01_sfnt_off00012e88.bin
bc3953503810c273f2b230e33cf4a4ed4212631bb8ddf52b0bf8286015db1241
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E88 10976 bytes
font_02_sfnt_off0001479a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1479A 16792 bytes