Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a874ee6303c705f…

MALICIOUS

PDF

72.7 KB Created: 2021-09-13 17:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f173b30d5a5a0a8d50a9cc3f2c3ce471 SHA-1: bfec75a5399de8ba940161a19a6f63067c3e7ab1 SHA-256: 4a874ee6303c705f560eda117634763bec510b8065f6e98a61a3ae716c6d6033
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute further malicious content. The embedded JavaScript likely facilitates the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://usmleworkout.com/files/file/bemudetudepolalatekukariw.pdf In PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/85589006878.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/rusumewujonok.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/8unp08l66pu8tn2uj8i0mobu53/47128265416.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/210590218061361c9cb5b66.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/sigajifuloveketafadul.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/sakenuwa.pdfIn PDF document text
    • https://unaizahic.com/Files/files/famuporajapuken.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/34490347228.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/sozobevonagebimeda.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/4269237789.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/24900834382.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/60915201686.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/feboluwipekibumuguravuf.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/dowaxa.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/vivujiju.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/loporesoju.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134688f658bd---32958313421.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/2683267194.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/65965414189.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/73684429763.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/69766781614.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d0df3fa4a80da57b2dfc5034fbe66eb9/ruvazitajoninurakubaxiba.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/danabikonivevimot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hack+instagram+apk+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A0 16960 bytes
SHA-256: 0b601105a8dcfbd01a4c2d770921aacabf7a87762ee5d9f86834365691392bf1
font_01_sfnt_off0000e417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE417 10896 bytes
SHA-256: ac10b7660785a9a0512889a5e6f7c8a31bde5aa15c927c5519197d5fc3dbac24
font_02_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.