Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e6b52727baa8e3…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 18:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28d1c39ee3dd63f197452704db6c89c7 SHA-1: 0eff042a8f24cda856e853fa121cb1dde692e2c6 SHA-256: 85e6b52727baa8e3aea5333d6ef85765479b9274cefd724a46160bc209eb2db5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. The presence of embedded JavaScript (T1059.007) further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://goldgreiner.de/userfiles/file/59762014421.pdf In PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/53141040293.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/95697811085.pdfIn PDF document text
    • http://terminsk.by/pics/files/muxebemafolopisiwosorara.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/93325303923.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/pojufufuw.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sgonvc50283ivabj6rfsal4d37/jemimamusogiviwigat.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/tuwofubemejujutes.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/watiwiz.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/vojumitozomuzaxewonipedu.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/14541883487.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/57368895844.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/garovaxisenaj.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/5232628690.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe2c649c67---rejaguwuridata.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/88914776323.pdfIn PDF document text
    • https://abriganature.centralcms.cloud/galeria/files/lewekedi.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/zavunikaji.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481afc9d702---solilizozuwoza.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/binukakusegipojeligiv.pdfIn PDF document text
    • http://capableapp.com/uploads/files/rajebiwejuverojupususew.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/49324503346.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4a1e79f83---xetijavavufolup.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/fajazirigagewesaveti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shape+poem+definitionPDF 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_off0000ecdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDC 17944 bytes
SHA-256: ad0be93f1d1a93a411f4880b8cb9c7d622ff944f2f1e83cccbebc3b3cb00b46b
font_01_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B8 10524 bytes
SHA-256: cee2825e45ec59991b2078a6b7686703f860ddf14d5b9e95d10e4ea959439708

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