Malicious PDF — malware analysis report

Static analysis result for SHA-256 c350d991687a725c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 18:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c5e5440c5aa99ba0a812ff4b8ae6f15 SHA-1: 7068d91ffa0ba497fe6a2c8ec58581df0a92b51a SHA-256: c350d991687a725c365009949056586d1e386f4a7fdfd135ac318b595385231d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect the user to a malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://inprovitecuador.com/ckfinder/userfiles/files/94742211943.pdf In PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/retunawexuxap.pdfIn PDF document text
    • http://orem.mn/uploads/files/menariwifubegisitoja.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/gaguw.pdfIn PDF document text
    • https://croatia-flyfishing.com/files/kupixori.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/werag.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/96635948170.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/4824877303.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/zudifufijedubibefifamu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bojawijuvawujomala.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161359581c78cb---21456125602.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/2284169405.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/lanikuzevixewapukipevew.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/41335557619.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/pevavosovozupuvupi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/86852410530.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/74404910753.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/devoxikurefalu.pdfIn PDF document text
    • http://esistore.com/userfiles/file/93403268632.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/jogewijokaxujuvobit.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deaa66bdfb---fivorib.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/21699e9ab5ada82aac7ad478a32ac836/rumasavewow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=11th+science+subjects+booksPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 10436 bytes
SHA-256: ed36bc49c9a92cf24efcc160ff8bfb6a4431e06cf80533cd0c0a43c64890439a
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 17884 bytes
SHA-256: 69d1d8172a367859c98485223cf82981e4ad2c4211c35fadd478bd6ad965c451

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