Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fd705155b051f5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 17:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 730213e737ec8dd5c2cd98848138f9d7 SHA-1: 05adb53fb3b20a87eb5cd7389b99ff2db1202af2 SHA-256: 72fd705155b051f597163ebd3aa2baceb395ffc5bf85ecf1f05ded038e680372
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URIs, many pointing to compromised CMS upload storage. The ML classifier and ClamAV strongly indicate maliciousness, likely for SEO poisoning or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://thebookonpersonaltransformation.com/FCKeditor/file/buxobobasuzelesalefewiwi.pdf In PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/36cal1susj1u8shfsuu6ju8fjm/momesemitovesutififobokiw.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/p64rbaenqg7i31m4rb1d2c21ke/vawer.pdfIn PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/muvate.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c96fb208ef802c24970cadd297a80fc0/51253906609.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/ak62uhbt1ngtah8ns25nscb786/gewifeziweno.pdfIn PDF document text
    • http://stepsforstarlight.com/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/15567257870.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/a64f0a0637adb0c5449c31d7df0c8989/28397177602.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/liniburopefosawinuti.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/46198957613.pdfIn PDF document text
    • http://seamacros.com/upload/file/wutadolovaxevodoti.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/viwapijagexukade.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mogikoninujunota.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r6u1qum8hvi1jl41ic1bg7ng2u/16549568808.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/12486284341.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/voruwabapan.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11fa0d48---salebadotigu.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/wedunobejafoketojelunode.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/24249952191.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/7f8a6e83d3b43833126ed855d1489d66/gudug.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b4f8d088b---5759393677.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609420f080cae---vexesebutamizemelumi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/wusukonoxuxavibosinewuwe.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78d921ddf---farobifununenixide.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/831e9db084c0d05e45af3d1b38ecb2a0/71084940987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pharmacotherapy+handbook+10th+edition+pdf+free+downloadPDF 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_off0000c623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC623 20088 bytes
SHA-256: 4e699492f009d8c6235650c6f3889ff193c212d9ce74d89e628b324a9a07c0c3
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 11324 bytes
SHA-256: d18acbd92c87e528a0b5fae705177a3b9f03d026ec5bf3e3ad33a7f9533b4d02
font_02_sfnt_off00011383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11383 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1