Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c32b77af841e03…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 06:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a0006de30a114cfdb746f0dc34344e80 SHA-1: 7cd650dc9b976103c53ee7dd851bfb177f0360cd SHA-256: 84c32b77af841e03177db8fcfe4dac08fb5b6d4af8c08a2258cbfd2b89120065
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • 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.
  • 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://haisushitogo.com/uploads/files/82119133477.pdf In PDF document text
    • http://pinedafoundation.org/imageuploads/file/68212235436.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdb73bd4df---zedovuwijexorepo.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/pmb867ulelilnhob7fu2s22eiq/92082057025.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/40098069223.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072f93d8138b---femasopenoniz.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/37272556167.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/85357662932.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/83288051649.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/xabudefu.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c4319dec1---72693261617.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/8613312558.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/39620553650.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-8/file/babibixobixotewarirumesi.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/fefatizew.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/0p2cg4v9h7a6a0gvo3fl8rht7f/81098730950.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/dipewaralonekurisuxureseb.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/wukataposamixuraleginug.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ef5a3bc5b---2054893907.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c66ee05a697---tijerogokipuwazuseg.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/pakurifugugeb.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/63466848629.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/27294516119.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/wojekanilarefitiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jaeger+eye+chart+pdfPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/pezopi.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_off0000d7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F8 18100 bytes
SHA-256: e125ae485d156872775486cf6e1f8e590bf0fb51f9ff5007347d81d5f4baaa29
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED3 10476 bytes
SHA-256: 4320909f50622f0f7dc6e1cc3667db6f9a8c3b198d0408ce1c9dc63ed022e615