Malicious PDF — malware analysis report

Static analysis result for SHA-256 0478b20de1d5b232…

MALICIOUS

PDF

82.6 KB Created: 2021-08-22 02:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99935e2f962fb47159bcbf02fee1aea3 SHA-1: fce1936eb6470673c9ee50b9d0db446c6a19696d SHA-256: 0478b20de1d5b2325e9d7c1aa00c81c7699f4f18803a1c8e4de47a6c7dc0c20f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous links and the 'SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://duocmyphamcongty.com/app/webroot/uploads/files/nexutasek.pdf In PDF document text
    • http://hjtech.org/admin/upfile/file/jajaboluziwu.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/retafaxum.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/23649694418.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/40487157486.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32e50bb5f---48541495405.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/gogutudinilalinos.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/widujumosanuwikadokaxirab.pdfIn PDF document text
    • https://soltendance.com/stockages/files/9640701351.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/b28cb318199a01d308dd549fa6a97227/86504258889.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/xunago.pdfIn PDF document text
    • http://getem.plfiles/file/3744641348.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077634f1f4f3---31737368665.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609265dee10df---87514674184.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/15465538431.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/2102294766fb73e2853e6e78dbbaed6a/kuveni.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/30983985632.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/anp86kirgc274sn98ep5og2sl2/25327789968.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/pivebusegatusure.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/97570254058.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/76d82456a890d1ed288794a9f4daaf33/72197998860.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cf946255c---kogebibivarawuvupodu.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/99749861855.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+get+shiny+pokemon+with+qr+codesPDF 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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 11184 bytes
SHA-256: 33d5b955a4e193671ece974fd996eca4b9364d332116342a1004b89e9ef047d6
font_01_sfnt_off0000f83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 17024 bytes
SHA-256: 750b3da8f8f68ab717f6f3e6a7a028b5e6eecd08a96d828d2503ab6b78d58fa8

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