Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff7d096f11182be…

MALICIOUS

PDF

92.6 KB Created: 2021-07-13 17:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9f49f4975698f751ab051a00017925ba SHA-1: e633f339f09320f31a031c18eef6dcc5814e40ea SHA-256: eff7d096f11182be49ba9c242078dc3f05696581e8049961119ddbd5cbeb9561
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f6ec4538---xotogegadajomagu.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ffe101aa1---nikisinu.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/rr7sdo0not30285k934l0avbp4/3218146349.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54309932013.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081058c2823e---76362248213.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/bazepow.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084bda7e245e---todurukabakunur.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/nerubowudukalizufapide.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/tofotutadulenofol.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe01107dbc---fijazorelibegeboxovum.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/25329885700.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6ci0ia9voiuvo1ltcke9q4sip0/60839328566.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/60e102fd56a8dbffd734a399d08508a6/89002965409.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/sawot.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6894107a7885af0ddc059cf494d87251/sexagikegopuwubuxetogif.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc5a1b0407---35360250989.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/xasojojewiwazukamibeza.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/62549155817.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84afe5b2c---xovavubotufenu.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9c8783ff488bff5f1f0c4770ae0d9668/newenamonuwitixovasoke.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d8cc24fcc---jasuriz.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de110490c7---40691756401.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/72b0ae2a50a05d899d97587d80135336/bidobonediz.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/i097pejnhbl204u9ndtor7b2p0/72081541876.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/177ef280b5d54a08bc6cab3a5102c5dc/bigimuzagivos.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/wuroworixaxuf.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/jubigoloxewasusego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=dempsey+hill+cookhouse+and+barPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB8 16392 bytes
SHA-256: e9a704d00dd6e8ff808373eafce3a9164bafc01e3896b7f7a96cfc50231b2c9e
font_01_sfnt_off000104e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E9 11128 bytes
SHA-256: 619a0542e33d9d567ea33d86dd52a0b1722ece3b1a608f59f7b82721e90e298e
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 17296 bytes
SHA-256: 9d57b7cf39d6a350ae001225d561dc599271844438e6b2f9417e9fec85b6ceb8
font_03_sfnt_off00014c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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