Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f91131edd46703…

MALICIOUS

PDF

95.6 KB Created: 2021-07-23 03:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c2d85d1318dea69d699667bf69a6abf SHA-1: 3645c79898276cb03014933ce45a173c71cff016 SHA-256: 49f91131edd46703ee854f21b7140343057ea81808948170261918193bfc1933
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of numerous unknown URLs further supports this, as they likely serve as the final destinations for the phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/abf7030047affb29cd90831d9db2c61e/51917958151.pdf In PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/takonewusimu.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bvch0k0069ucn3cfl6t5g1ffio/kebovulavu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef1793dc83---dugobis.pdfIn PDF document text
    • https://ovalpolycoats.com/media/42413309536.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/sifavoriduri.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-8/20210708004328180007.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d384487ff6---damamunuwokazunow.pdfIn PDF document text
    • http://jar-ted.pl/file/zofemevupa.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/gonej.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/0698bc1464d08b6877d98e58022cab2f/fegowobonununifaritedevi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160e572496ea5b---fidebomidigomitaziliratu.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2ad4b3ff58460d78f367f29d8c1401a6/wawekof.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/54fa0c2467c2392c314510128549db08/jakatagibufusapile.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ee364b286---85631572771.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb6379b8f7---wariwusiw.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/71394422910.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8c34b4c40fa660bd0b172a6939a8eabf/vizuzifovototunaribamilim.pdfIn PDF document text
    • http://esejsc.com/upload/files/kuxamen.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e7572ce0c---bixukilebunobif.pdfIn PDF document text
    • https://actorconseil.com/files/file/xesuxolenisikeju.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zuzuve.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/46137432555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=solutions+upper+intermediate+student%27s+book+2nd+edition+audioPDF 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_off00010170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11987 11116 bytes
SHA-256: 44e145200d0c17649ef119942712d6eb1d61c07cbb82483fd0ee7a396f86fa46
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 23300 bytes
SHA-256: 42b9a4f974b0e5065a04f0d395b33bbed707ba29c6c716f834cb878ee0fa8f2c

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