Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1273e8910ffbb6…

MALICIOUS

PDF

153.8 KB Created: 2021-07-31 17:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 386134e09711883a9c096675cc28bf8d SHA-1: 6f50c489c529ef339745cc0ff4df03a9a2a93e79 SHA-256: 2d1273e8910ffbb60835a80a828611d4f911d6a1a63b50220cc7ab08981bb1fa
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to lure users into downloading further malware or engaging in phishing activities. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smidgel.ru/uplcv?utm_term=data+communication+and+networking+3rd+edition+solution+manual+pdf PDF link annotation
    • https://kozhikodedeaf.org/admin/my_files/file/67374796880.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6bfc193c2---woxufaviwu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf516655cc---nawozaj.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b697cfe4---84638654033.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813fd065d2e---duruvopufigexafigeju.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tufalo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d7658240---xawoxuregelajaxinopimo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lovubotitegesop.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75aec7396---tetate.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089db8b72e03---worudixexologobi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d2524df6a33f194a03d121c13a5f6374/33306857484.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5be4a262---1748626703.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/zimobe.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bofofadumijisidiramubux.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dibilalezekiriwuna.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/doruvusuf.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/93911295078.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac70f780---netalufaliribojasitunade.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb89f9b545---fiterevoludinekomerebol.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/85776129247.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/dasujuzevenirenu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/pisugo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lf1npektqr6vrnj3jeb71jpel7/govezuwakutenejujimajo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084107fe7978---jelapemorodami.pdfIn PDF document text
    • 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_off0001f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F61C 11416 bytes
SHA-256: 03e071752526d7316db9fe8d795355772603bb6d19bc4f30c134c066069bfbb2
font_01_sfnt_off000210f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x210F3 18232 bytes
SHA-256: a3f0839c8d7a6716d9e72ec12c910701080b15b97f582850f14e261836464eb2
font_02_sfnt_off00024007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1