Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9021216b551cdfa…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 21:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6370b37ef1de79d134b8777a6b601b7b SHA-1: a898a929126cc5f3e4c979a874e4737e5a2bf312 SHA-256: f9021216b551cdfae269e708d0fce7c04a40bcbc926c69782031cde2e3502653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and other disposable hosting sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users, suggesting an attack pattern aimed at phishing or delivering further malware. The presence of multiple external URIs and the ML classification strongly support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://stellamaris.cz/userfiles/67725235263.pdf In PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/aafab1945bba0db1f0b408d52e6b3399/69071733583.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d215a19de1f5802f33dc7f6e08050546/tutalemefajarololal.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/efdb09cfc4dd5de391cf15f1c9d41568/28024274039.pdfIn PDF document text
    • https://ferropula.hr/files/xapatavomevebogadawikokex.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/52fcbe834f8a67d0a7b79424a660d155/53705992339.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160985596ac090---luwopegemetawuzi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a032d1691a2---nemazelusalugetu.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160aba4e2a2df9---sadobofilitejadi.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6031619f---tikimomekomepiguwokubo.pdfIn PDF document text
    • http://teplospectr.ru/images/files/73668897443.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/luzivavanafuve.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/galefabeku.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/86755775508.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210611112819.pdfIn PDF document text
    • https://penal-garazh.ru/files/15349870627.pdfIn PDF document text
    • https://sealskinz.ru/files/file/78692230366.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/mazikijiwaje.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/kakanewumekagilu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ead744395d41fd385ec8dc5ee985a566/liluxaturexebobe.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/56364184611.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202108201521459035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=movement+disorders+book+pdfPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 16808 bytes
SHA-256: 704ceb2ba78c619ddd95eab8fbd18495a29534c6bc2164b3385d3a53047756f1
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 10740 bytes
SHA-256: 58ed92a7118fad389c96f22b6348131a73400779f67e45695c5f006a1c70fd2a

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