Malicious PDF — malware analysis report

Static analysis result for SHA-256 e17043f3d3b0d89e…

MALICIOUS

PDF

89.5 KB Created: 2021-08-13 16:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a928011ea31d2815b214a2858d2db5f7 SHA-1: a27d0cf819066d852fc52d82ec00c2dde86a105d SHA-256: e17043f3d3b0d89efff686884aeed1629e5154052a061d239e9fe3fa5c36193c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, which in turn host other PDF files. The presence of numerous distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially engage in SEO poisoning for malicious distribution. The document body is unreadable, but the heuristic findings strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0371309d94---29493819028.pdf In PDF document text
    • http://deepakbatteries.com/uploads/file/pasitopowijinuriw.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bb93ec14a---jinuxolijovaf.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a1a4f9262dde14442deae2a05d00ba8b/40267381664.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f2c1669e---nakuxonegokide.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/033a5mc2toe4iiurmqm2kctqk5/kakefupexovabejaw.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/jawalifutubusuguwezazavit.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/kc4s3h0lmdshvga5pcp0vghn9p/fagujekir.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/riwulufedez.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0585359851ad49fd038a8b4d9f1af5b/98516335509.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jejetakadijunewudazi.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/50314882749.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b551fd41919---7550304635.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/95sdahmc922kpe2biilae6n3r1/29833997287.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/gaxelelemutaxozexil.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bd131cb3c57717c23f562273f45d9fed/87626944416.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/99124637283.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c6b4f459b8dcb0f4d3895b12c8900cd9/92365652127.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c65469138c7---takoniwuvebi.pdfIn PDF document text
    • https://bem-sa.com/img/file/buvuzosi.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/801f6c9e510ac7ef55cc5088e4f5108a/pizugiv.pdfIn PDF document text
    • https://service-panev.com/userfiles/62820126564.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/4b5ier7ppa67nviemallouge61/zitijefatajesejewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+connect+a+bluetooth+soundbar+to+a+vizio+tvPDF 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_off0000f9ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EE 16904 bytes
SHA-256: 04df643b591c8d3aa315c17d6ebee21985223ef0841f6c874093170d99202ef3
font_01_sfnt_off000125c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C5 10912 bytes
SHA-256: ef1412a1996695604a28cc3c35c7c62c22c3a13ea81798b1c97e3028e3cc1910
font_02_sfnt_off00013eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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