Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfe10bd73532523…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8833a3fd3c2eb2593e71f6bad38099ea SHA-1: 85e6f0a15c36aca0d16bf8b24b0a3697603b0227 SHA-256: 1bfe10bd735325231d81938ce4b20acca06107ecbf75c9caf12dec4ce18d1cf7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is likely used to facilitate these redirects or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://girl0229960192.com/upload/users/files/weditugixozonapude.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5ff094e8403cf7da4a3a45805e8971ac/sarefu.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0ddfb1ce42aa03dc4052d55fe8bc14c8/suvivinamu.pdf
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/271563de1248560bca1dec38874a65cc/marajipilosu.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca14e5aa3a---97149029046.pdf
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/a8715adf66f160099af22b7cc2ee2baf/xumewuxuloref.pdf
    • https://malashealthcare.com/userfiles/files/18783996009.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608540e5d4098---34268364461.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160802a4f444fc---46953440690.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1d730822---74084607867.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160aabae9ee45d---35357954815.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/17167570112.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/dudefumubaturifixe.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9df776cf---72888068709.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8130cde77---60389079801.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9a335cea7---79197244564.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c163a36c02---milopavazusolelus.pdf
    • http://peak-experience-japan.com/xavetaze.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607643320252e---61920423571.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703432882e3---52644867069.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/955a1194bbad8a218666a1d77870a2f6/74357819875.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/6q5c2qpg9bdf68csu3o7hlva40/liladevivabemixonodibu.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080412a4f12c---ruwinukufonetiwubafebepox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+latex+companion+2nd+edition+pdf+download
    • 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_off0000f07f.bin
4eac336fac24501b8c388932393922f018be776a1da50dfc9233e1636c4b3190
pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 19048 bytes
font_01_sfnt_off000121d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
font_02_sfnt_off000139e9.bin
5244e0da9236b39911ed0af6b7916ad44c7b0bcead89d9af35a82f830f681bf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E9 10888 bytes