Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca941b9e54806ae3…

MALICIOUS

PDF

73.1 KB Created: 2021-09-05 09:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d431f62074c667d42d5efc9370a606df SHA-1: 4f023470d2388859ffa30193cf41fb00019aec49 SHA-256: ca941b9e54806ae3928468336ea3ca7d83c5121145810215778d6629c98e0492
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, which in turn host other PDF files. The presence of a raw IP address in one of the URIs further suggests suspicious activity. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct clues about its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/eb44e36f831ab475aa3866a97e979234/49861329670.pdf In PDF document text
    • https://migger.dk/userimages/file/28881549604.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/df96fcacccf2ea501fb1122976e17ca2/nufibunafeligarewemufi.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16106828c814cd---fumazezifupimo.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b580e9aca---61214486929.pdfIn PDF document text
    • http://thaide.org/userfiles/file/66597922041.pdfIn PDF document text
    • http://atomleasing.ru/media/File/59706931839.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/51399710253.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/97226441148.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/64010528567.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/suberiragapovasosujijexo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160de09cfb5dac---mutid.pdfPDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5a2809828---15525731018.pdfIn PDF document text
    • https://buyafranchise.org/files/files/pokesekupukazolo.pdfIn PDF document text
    • http://dvarenda.ru/upload/file/motenofijoxavoxobobi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2ths311v01i90qqkns10a7pjt9/84319822925.pdfIn PDF document text
    • http://jpmoto.biz/upload_picture/tojunojekutalapid.pdfIn PDF document text
    • http://martonelektro.hu/files/file/54550077262.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1905daa412---posamozakogoxefikajuner.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/g1r5b87eqttn58vn620i085sk1/96508935086.pdfIn PDF document text
    • http://groupkaishan.com/d/files/juwodekoxub.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/37dbmft7i9ke540humvumtc2k7/45835265116.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51731e85b---subezosimodafafunikazip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=thinking+skills+worksheets+for+grade+2PDF 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_off0000bdbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBC 10892 bytes
SHA-256: ab0531528c8587a1b1394f6454c8f04e99cb595bd12c63ea95f25621026c98ff
font_01_sfnt_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 15576 bytes
SHA-256: 0bbab88ba917ddd1b5c68dbb9f4302368fd23064ce536d0fe4bace70f377e17b
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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