Malicious PDF — malware analysis report

Static analysis result for SHA-256 c163f7e93bc050c6…

MALICIOUS

PDF

83.2 KB Created: 2021-09-17 11:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abd1b27edf9a0f3844fa99a6494b6cfc SHA-1: d4946028884d02b6d478b96c169cf4960378e4ad SHA-256: c163f7e93bc050c694de9fd3646a2732b43f08dfddfb7cb139013389a88370ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, likely to redirect users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code, potentially for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=a+brief+history+of+humankind+pdf PDF link annotation
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xofoxerogaxabebukogupamo.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/95503511931.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gefaxediv.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/zefin.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/38948621918.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/91440453628.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/2f2kcm1kvkev3gq9c4tinn2sov/85291909968.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/58829423190.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/kifevasigenatujibojomud.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/7174349358.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mikitofiw.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/48561115660.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/pusari.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/putuxepetikuwexokene.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/82898900005.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/nuwope.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/kigulasovomewebete.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kudajaremapavenufosiz.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/todigelozog.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142c536d5ded---95884275211.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/69457017979.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa08e1ab35---beporokukivi.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/danuriwefubedenumimixake.pdfIn PDF document text
    • https://olterus.net/contents/files/novusakezugapi.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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 11144 bytes
SHA-256: 5ff3c7fd4a4f8c43a3b9694bb0fa6c031008cfe5d4b58d96efed598c285d9967
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 18568 bytes
SHA-256: 095709421cd612bb899430d3a5889f70d19965fddb70252e786082523d9eacb4
font_02_sfnt_off0001276f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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