Malicious PDF — malware analysis report

Static analysis result for SHA-256 d978c896028f98c5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 14:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b8e68977f7846aa99411a10ee6c0a548 SHA-1: 10695098471c31db4a71fcd2322afe013dd73178 SHA-256: d978c896028f98c57d0a75807525dfb7dbfc4e773940eab01e7a021655b0729c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. Heuristics suggest these links are part of a SEO poisoning or phishing campaign, aiming to lure users to download further malicious files or compromise their credentials. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6147

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=oreo+os+download PDF link annotation
    • http://akinmedikal.com/uploads/file/fiwetefatuwik.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/mixodumilexadurinawer.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210912_5255D594F5ABF3D8.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/xovipawezoliz.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e162c2c8d---likanomix.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210917124903261925.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/81759059261.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/belexijubipu.pdfIn PDF document text
    • http://nationalherbo.com/userfiles/file/60536283618.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/11988270121.pdfIn PDF document text
    • http://www.hebrewforreadingcomprehension.com/content/zobelamik.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/nokiturinowipat.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/17579668409.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/xotinaxe.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/0t345o24re87f07lltthlhfil1/fizugivuboxewuruwakaw.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/6079240329.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/61013821487.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613645d8d9639---82837701038.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/zisonetiz.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/25064609291.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pinetefejamowina.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/32262954781.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/barulobajapitowuj.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/4650975207.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 19380 bytes
SHA-256: 023ca931a10e265880f6ae58e96cbc3f9e6e8a14b1233aebad36544fa2ff85ad

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