Malicious PDF — malware analysis report

Static analysis result for SHA-256 042e647c6288b8f4…

MALICIOUS

PDF

62.9 KB Created: 2021-09-23 09:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fe00f89cc14543c2afab662620e97111 SHA-1: 8e458ca5aabe20f95933e032a8f4a50deddddcde SHA-256: 042e647c6288b8f490144f8291ea55d8e4b842dcb6c5143afd53e256112fab26
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to external resources, many hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to other sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7270

Heuristics 5

  • 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
  • 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://incense888.com/uploads/files/202109191308013386.pdf In PDF document text
    • http://studioagm.it/userfiles/files/21179050655.pdfIn PDF document text
    • http://balone.net/_upload/file///jomutexuvavisuwegapa.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210919225554.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/94094133056.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/wupuv.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161486d5d9bbc1---86996005074.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/94713548139.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/ladivexukafuroj.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/82680978771.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38546540833.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/nubaviniporasulinamese.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/14267128239.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jafijetafozokokizobi.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/95029403112.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/94072545523.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1acd724eb---46496823632.pdfIn PDF document text
    • http://zaiger.ru/img/file/65194862940.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/13149252900.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/dee92f1122f24935ae57e32bf9000f65.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/tcvu0e3r8u9al7fvqbrhj8sba3/vatarozigov.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/famokakajewikoxek.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/582ba4af08eb48bc3abeb44378fdb7a0/14507032480.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/devitafisunoguru.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/45297842896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=munson+young+and+okiishi%27s+fundamentals+of+fluid+mechanics+pdfPDF link annotation
    • 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_off0000ce23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE23 11300 bytes
SHA-256: 1d2bf880515a430ee278f93d81a2b5d04c0e0d1236db41d3b84f23f993861aaa

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