Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce866b5ca9ba4379…

MALICIOUS

PDF

88.2 KB Created: 2021-09-20 10:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 555dfaf6272ba230e0f4420b67bc1c39 SHA-1: c51e07b8f4436f24562111db65edcd8fc2d1be1c SHA-256: ce866b5ca9ba4379c4d9182a73cacbafcbd0ce09423e81c307361ea50bdec23e
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a download button lure further supports this, although no specific script was extracted to detail payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=final+fantasy+7+mod+apk+download PDF link annotation
    • https://soechi.net/userfiles/file/bezekujib.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/rixudoxajogibuw.pdfIn PDF document text
    • https://seerupit.dk/assens/file/noliv.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/83388683171.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613d13ba9fcef---wevedunonafagakagakas.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134155864d49---24664937048.pdfIn PDF document text
    • http://africareview.in/userfiles/file/87381172397.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210918_041229.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/8621249816.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/voxidod.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d194a694c---zudazadoxofubebap.pdfIn PDF document text
    • http://showpelec.com/data/file/20210904_032811_988.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/46213803907.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/70191993351.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/bomiregexira.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/zikawoniwavuwo.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/60512039176.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/jofeworozaxe.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401758a29cc---gufixedowavi.pdfIn PDF document text
    • https://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/22525470037.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/mudobusuwujupebonax.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/95952732448.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_off0000f1e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FC 10748 bytes
SHA-256: bc44cc937d4f6574b2f90971c9b9179aed3da70a904be2f608d7d226817c41e3
font_02_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 18520 bytes
SHA-256: 65d18dbd994735435ed0097101b457e4fa877b43101d1093fe6ebf7c9216fe8a

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