Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0131412bd39f35…

MALICIOUS

PDF

74.1 KB Created: 2021-10-12 23:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10f5826d2ac3e5ed92e940cf842cd996 SHA-1: 0446ad62e8c62f74bbd1a7bedca96101fb1dd9b9 SHA-256: fb0131412bd39f35ce698ca89ef87c422689bdd2d052434f7240a8e05d81f624
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which are identified as compromised CMS uploads. The presence of these links suggests an attempt to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://meditopthailand.com/file/kalasivaj.pdf In PDF document text
    • https://alixdemassy.fr/userfiles/file/jezefejapunenetewi.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/65304343151.pdfIn PDF document text
    • http://exima.kr/userData/board/file/4569590854.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/76586332686.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/97067776285.pdfIn PDF document text
    • http://semanbio.com/upload/files/26907431397.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/jolidupadanu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/72881603339.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/xarunoxofowifekesaf.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/51542423937.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/657b8df43310dfa9d992c3e764ec40cb/98662474812.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/61717039759.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/budemuwabe.pdfIn PDF document text
    • http://tlumacz-francuskiego.pl/userfiles/file/81059155317.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/zariko.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161564f49f0a33---linifibo.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/63549528839.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/pojuzudizeruzejuv.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3f626d4ca8db00a9a6d11d16070b75e1/viseso.pdfIn PDF document text
    • http://szm.hu/userfiles/file/63936586693.pdfIn PDF document text
    • http://papianiarch.it/userfiles/files/towatozog.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/3888850418.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RhDyTiV0TgQ/uplcv?utm_term=camera+parts+and+functions+pptPDF 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_off0000bc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 10864 bytes
SHA-256: b913ca79e931e59cd6df62cfd07cc98331c89da0fb9cf79d0f05b882e9a3b6b4
font_02_sfnt_off0000ed88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 17632 bytes
SHA-256: 3ce605cef9552e2bf5914130feeebd8e4829c203be2321aab1e6d671753dc84a