Malicious PDF — malware analysis report

Static analysis result for SHA-256 3572c88d8bd09d6b…

MALICIOUS

PDF

54.6 KB Created: 2021-09-13 17:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 864d40d754060898edfcd605d70a3c25 SHA-1: 6aa33170de1dd23d3f64f8bf6f728a00a9730737 SHA-256: 3572c88d8bd09d6ba49c67da898056ce8ba3e666264694a87f3d256517070190
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and a high number of links, many pointing to compromised CMS upload storage or disposable hosting. The embedded JavaScript and link farm suggest an attempt to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6441

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • 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://songhong-thudo.com/img/files/56610061743.pdf In PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb2946ce9---rifusepogigedusebinagene.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/11792766415.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/75700489431.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/855645568.pdfIn PDF document text
    • http://cjatkinson.com/userimages/tovepusononeza.pdfIn PDF document text
    • http://citra.cl/userfiles/file/67215656010.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161367b2d06f34---difudowojutomolesoroso.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/98546971819.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/tozirubazetixaj.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/27061517878.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///jizijozujonux.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16131ca3a53954---72009708344.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/28049494288.pdfIn PDF document text
    • https://aokman-drive.com/d/files/16215646145.pdfIn PDF document text
    • https://dptech.vn/uploads/files/24611071611.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/65788530829.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/84537044303.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/pawobasirovonuxukujaw.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/gutadiwexaki.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/sijimuvimenejupamofobexip.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/dizibefozuritelev.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/2j0b2pi914gs7smdh9nqu3vli7/mepisifopufeziketekuda.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/53589576939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=screen+mirroring+my+phone+to+laptopPDF link annotation

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