Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c4d47d8cb84b73…

MALICIOUS

PDF

83.0 KB Created: 2021-09-04 20:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 495deef50c27f54d3e4d12de6ff63eff SHA-1: 15b7199731fb5896cae82fbb33c6adeef505d6e6 SHA-256: 41c4d47d8cb84b73b248899fb690811953fcf90e72d40bc603413379ccbe2edd
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cosmeticdermatologymiamibeach.com/uploads/data/files/70831426574.pdf In PDF document text
    • https://kawanmto.com/contents//files/lofafur.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/bitexamesu.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/mamakenipil.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/setukebixegumefoteb.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qecfttharifef73otv8j2qs865/xezezufuribenopebelofof.pdfIn PDF document text
    • http://fruitvita.com/files/files/guxesu.pdfIn PDF document text
    • http://isvpro.com/custom/files/99137333700.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f04723c698f---tuzukirifefaxegowikok.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/lazis.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/93997335008.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27593d97c0---peposizixixal.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/fanuriwuponovewupujo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608918dda299f---96167207981.pdfIn PDF document text
    • http://www.heatandgas.com//EditorImages/file/33183961671.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c6d12483654ce12ca7bf9662ba6f8980/sogowizofefaratujosan.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/jemerujoti.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/pijotukebogosizimidi.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/676i06ph05to7cs055l45hdifl/zarutuzobo.pdfIn PDF document text
    • http://bjjiffy.com/upload/2136032109.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/finewodijalosaw.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/79559160321.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160740ce0ae4ab---8666044285.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/rafapebilepigivon.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/mumijipuvotarezugo.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/i7hflaleq4d1189te6o7n9u9jh/73719187543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mcgraw+hill+ryerson+mathematics+8+pdfPDF 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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 17008 bytes
SHA-256: ea0ef75c38d0f429afcf172e63f2e160f62d66fa8dbad8a733f56ba9cf4bf6ee
font_02_sfnt_off0001236d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236D 11468 bytes
SHA-256: 135b8ad9503c3705a36b559fa0ed70479b21434ba178d3b04e9bbbcdebe45aad

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