Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e921b783900603…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 23:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ecc7d705d459e87a69f5d949fe3d6ef9 SHA-1: bec87d9c1caf8c9cbefd5a5eedbaf9c9dced8c81 SHA-256: 56e921b78390060378afb5bdf3ae6bcc18eede17f7a7323b3cf447b0ef5d57bc
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the overall structure points to a link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pottoka.info/files/galeria/files/9608127246.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/32421272796.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/78792963663.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/wepavaxej.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/ziwap.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/33042633080.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413da7421c2---wufoxivorumokiwa.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/73100873129.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/37140469705.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/36161075521.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/14511290892.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/6f181aec8be688492044b6e207822470/75029769864.pdfIn PDF document text
    • https://activepymes.com/pub/file/272578151.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/78f0mc5as4055iub8ch44eut04/41590829017.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/61776451532.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090610272973499.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/kinelipuwele.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/gizarajavup.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/xafujafadaravazazebe.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/38451953557.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/98285661330.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rolisitofimofutifi.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/16400560320.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/85993991008.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/pegezoxukatixuwamovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+see+who+viewed+your+instagram+profile+the+mostPDF 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_off0000e7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C4 11304 bytes
SHA-256: 54120633e63cf5fa33ac329c74ceb73718bcabac66f8d9b4839348a4af3a56e8
font_01_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 18312 bytes
SHA-256: e3a9862b89ae3d9ef484ef25bfc8a6a888358d8febf0e7e309c6027c8dc390ee
font_02_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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