Malicious PDF — malware analysis report

Static analysis result for SHA-256 56680c4a62a4c33e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-26 14:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6657dcee05265ce4bab6478a575a81c9 SHA-1: 8d72f0a9ab94ba2d91b269410281eb390abebf9f SHA-256: 56680c4a62a4c33e6a6685f78e9cef9503987b9b7ef160c8da03d55a5e10a5ba
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://densayhongngoai.com/uploads/userfiles/file/wixibovofowigamadeza.pdf In PDF document text
    • http://mibenjamin.com/userfiles/file/dikesedobofijuz.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5a23c489d---derezumeser.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/91213472090.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161316b424b109---28386197674.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/16172169931.pdfIn PDF document text
    • https://simbotour.ro/ckfinder/userfiles/files/94896912900.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/suxijulanosinedat.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/31479380593.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/11376647051.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/69212843927.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/42167500901.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/10548645361.pdfIn PDF document text
    • http://cy2hand.com/userfiles/gamatuzoboketixij.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/babudonofavixujig.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/zuzigimubojalalupivopoxi.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/aa4bfe72732e92177ab3f683ccd7e748/dusibejivurizusas.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/43853043482.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109241014201991.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/39120965213.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/37041771994.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/43077824858.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50751066274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=parental+spyware+for+androidPDF 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_off0000b682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB682 17536 bytes
SHA-256: 90c51bd46ad4cc1c180c55f5b62bf57aae2a33573f04f37bd4d169411f2ebedf
font_01_sfnt_off0000e39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39F 10692 bytes
SHA-256: 091d87ee9e52127ca41cf684994e74b398e9958d43933f8e5da5145cc6deb48c
font_02_sfnt_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1