Malicious PDF — malware analysis report

Static analysis result for SHA-256 072b67867b929bc5…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 07:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 21673cb23d1583d87e956b1c65e680be SHA-1: 12d4b5a01647fc6737c0c1ffe52088b886eb84c7 SHA-256: 072b67867b929bc57d130003feaa2b7938bc8e9fc8f48209f01e7011dbb8e590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm. Notably, some links point to compromised CMS upload storage, suggesting an attempt to host malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://fotografoenricogiampieri.it/userfiles/files/39416255587.pdf In PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/vigikedufuvejibeguma.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/tojelufibonekizu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/fomigigebawawaxuruzobuwew1631098843.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3028aea45945d064435f238944957338/zonegodifadij.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613546d456dda---77030792302.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/060315268704.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/vukukapexoko.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5db7ce03c---puweko.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/68466360004.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/petoribodope.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/33616138090.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/91377196649.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/75289969163.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/vudavumak.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/vozik.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/savegudepopubusomawazu.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dasun.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/55872502159.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210904/files/20210904155757.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/98762859546.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/geduxewupixasokapeda.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/22250033025.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/serojeduneke.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/bogotivini.pdfIn PDF document text
    • https://dhesient.com/media/54413897746.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=tuner+lite+apkPDF 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_off0000e8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B7 10112 bytes
SHA-256: cf185eb0449adcde636f82973c708a01e0e3cb58618b8a01ab05974a6e090fe7
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 20056 bytes
SHA-256: 9cb38902fd017ca854010e30e0bbe46b2d465791d677c69b1307d54518f38063
font_02_sfnt_off0001346f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1