Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64bb7da6909bc08…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 20:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f86bc55d2595efdd24879166458979fa SHA-1: 47f4008b93fccd39316c6627a419577f4886ad52 SHA-256: a64bb7da6909bc08f0d790512dc4a29adc44e412fa303ed7face7fde26e4c0a5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains or compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://queure.ru/uplcv?utm_term=d+day+mod+apk+download PDF link annotation
    • https://rotitelor.com/contents/files/82093570293.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210917_022538.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/nowenumawize.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/sewaxuvuwof.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109061100265666.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161433912aa270---begam.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145c79700d70---38420446544.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/sukujonunazuzotejedegiw.pdfIn PDF document text
    • https://cafesca.mx/ckfinder/userfiles/files/doxok.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/doxirapiwek.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/3e248aa287fd4f74ca8e51b0accc7493/91992932042.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/96477552495.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/bekimodavizimipa.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/57633567680.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/28984199418.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/lafapowomutasowil.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/gizemuluromivupu.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/84305918407.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/vabarefilipusewatifur.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/47038243909.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/61296214860.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/52030978178.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/1110595765.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52F 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 19124 bytes
SHA-256: da72b39d127f356073bd93f6dc189ce4877fb6deb76bba975459ef06fcfa2cc4
font_02_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 10256 bytes
SHA-256: eb0168ffeeae182b8ad3be38926b262d36c35f2a29448cc959bd5c0609df6409
font_03_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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