Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5232ab4ff0d7821…

MALICIOUS

PDF

69.3 KB Created: 2021-09-09 10:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e19348e8b5be788fde125068449dfe17 SHA-1: 4e293296e8585db8a57f5ac0ddf0921a239ec0d8 SHA-256: d5232ab4ff0d7821dfd23fac9603f07f3ba2756386b0f558a1bc66b59bdeac7b
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and contains multiple heuristics indicating it functions as a link farm. The embedded URLs point to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4270

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://alakharia.com/public_html/userfiles/file/88552006919.pdf In PDF document text
    • http://nakajima-ya.com/upload/save_image/files/13249497012.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/2683069365.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0ac513ce---29918349972.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/lewunuronozopog.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/62466319931.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/nogasowisesogizamuve.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/73490387441.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/limivef.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/88242990492.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/joropuxitusolixijelawanin.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/24835428828.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/24296695593.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/70408888832.pdfIn PDF document text
    • http://popeyebio.com/upload/files/xejidapamibunaluga.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/taseraje.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219122563784.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed27eb2020---55863909961.pdfIn PDF document text
    • http://mcutech.net/files/78256943921.pdfIn PDF document text
    • http://miydz.com/mingyi/images/userfiles/file/78404016526.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/52962864326.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/sepajofilivumajaderot.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/puvokimodenexofugusenobo.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/44260043556.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369dceabbb6---sejamivonuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+lion+handbook+to+the+bible+free+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 10620 bytes
SHA-256: bd62031d90e93b85153a276cefe1ed71f34bb302b7dd67e708031112e8f25ba2
font_01_sfnt_off0000e0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1