Malicious PDF — malware analysis report

Static analysis result for SHA-256 f195800c85b75872…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 04:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9d4c75b1ddaa5a326ccfc2bd39bcab70 SHA-1: af3859d0bbc25f729f4fa1678034a4f429283e9e SHA-256: f195800c85b75872e68a4dd562e872c6ef86f0d82d7149f1bd966de57b84af7a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect the user to a malicious second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/89ef3ec0f7eaf84a83078fde74d727e2/12177617418.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/5512a8806014f77570913fc02515f68d/lepokitukukutejabolile.pdf
    • http://iwilldoit.ru/uploads/files/files/lesobisoj.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610307299ca65---84539697112.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6a6084fc40---resug.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/roxola.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c2e1e822eee330dad2b18069d5e24030/gegebif.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/8c99b943ffdf6e2f0542804809196ead/vijudinopafeguwefatedi.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/s08frcd447laru0udl0nl11243/726761991.pdf
    • http://mywayrtk.info/userfiles/file/netegofasubupazakevamusem.pdf
    • http://air-ned.com/uploads/files/karopa.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e528dc2a5e9f9753d606f0c72ed9909b/14051260593.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/2mi89jiiro89kb9ucoens36tk6/10516942854.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/01djhbb0k8vi0npvtp4u063qn1/bufumebu.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/9hgtnjrq65g2b2b3ceb9mkbvht/gibawefojebopebolakepiv.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/8otulhv0vrqohkup5s7gomspjc/84953542175.pdf
    • http://zuche0551.com/upload/file/jewig.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/kupopomujoditepexevu.pdf
    • https://raljob.com/userfiles/file/fewifufoduzufam.pdf
    • http://docando.es/js/ckfinder/userfiles/files/9828932214.pdf
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/bedosinubu.pdf
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/nujugavosafabizazugegesev.pdf
    • http://vom-ragnaroek.de/uploads/file/24677387446.pdf
    • https://rsun.pro/admin/ckfinder/userfiles/files/rufezemegodusef.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/svq4bqdutfglng64hcmn9irdo8/53748468385.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/95e81f94ace2920adad7c8edfc3832a9/rimufumidefubomesofobon.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/mimibujanupebumutujawuror.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=exercicios+adjunto+adverbial+e+adjunto+adnominal
    • 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_off0000f9fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FD 16792 bytes
font_01_sfnt_off00011214.bin
b09a8e38a9fe12ce559e1fec2a0a76ed913b42e3651dc9aff152cefcb42d6706
pdf-font-stream PDF embedded font (sfnt) at offset 0x11214 11052 bytes
font_02_sfnt_off00012bcf.bin
8ee061171ad28f3c95cf2e2908c10b1a9ba1dcaa0efd87af247e153f07ca4506
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCF 18812 bytes