Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed09282b8f28762…

MALICIOUS

PDF

83.5 KB Created: 2021-09-20 05:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 483058ae2845eb37bc6d86313e3255a9 SHA-1: 74ae8737090cd310fb05a14e524cd4c5fe8684ba SHA-256: 6ed09282b8f287620b1a6827142865be8f8f51c2d1e9af0d52c830728260622f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating it's a phishing or trojanized PDF. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary purpose seems to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=50+shades+of+darker+movie+download PDF link annotation
    • https://amigo-shop.105h.net/upload/files/28916091654.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/zusitazotoruk.pdfIn PDF document text
    • http://uhorder.com/upload/files/70765586090.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2109d055ca15704011eca8181af1b27c/69633677401.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab01cb73a6---gemugexojovaseluvuzine.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f49ba0881a---gikozekutozemajixiwe.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/begediviwipowolufuralopo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/ks6urj64ekaappdup07oevh485/66594747969.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/gipusuzulamijopukini.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/xijujimuzi.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/wumazuporomaju.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/65789965775.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/nusegapunoban.pdfIn PDF document text
    • http://vtaky.sk/media/file/62264675859.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/55617864806.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/98094596524.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/31016427339.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/wuxixiposumafabigu.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/70205362701.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/zosixemovikonosonuwu.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/xexupobemaz.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wusizoneturoxiwaterisuvim.pdfIn PDF document text
    • 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_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 10924 bytes
SHA-256: 3c98d0c9dd02373c4af8e26821ff3dcc877a08596234c75d07f5c3133a283098
font_02_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 17572 bytes
SHA-256: bb41034017a78f9d114ed03bbb56fc62d555d05ddd8755c345c45aafd545751c