Malicious PDF — malware analysis report

Static analysis result for SHA-256 20234a868b574e2c…

MALICIOUS

PDF

76.7 KB Created: 2021-07-14 09:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa3f2aa599a52327a3bec9ba72783f71 SHA-1: ec66e9fd3144304048ba34433caf45556f04e09d SHA-256: 20234a868b574e2c7e065b3824581740c5328772f9eedd2831a1469477f4b98c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://xn--80aamdqpfpr.xn--p1ai/upload_picture/97190846464.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fv1cti4obppkej22ha3o62phhs/dotuwudikutuzezugun.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f2052fc6a---tenavogifizufuzexekibatin.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/31518963290.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/xoderepevovanonopemewibe.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/d0sqgg5ujn493h4ortacst1ed5/gutixuvuviveke.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/6844383420.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/73207146703.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba284dad0a9---wulekogib.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072479377c2e---voludebonaromanem.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/36049611336.pdfIn PDF document text
    • http://chinahongji.com/d/files/79352905563.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/37263058884.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/486326d8a436a55ef28deb1a5cf70309/murodasuze.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758d3b546fd---67683717312.pdfIn PDF document text
    • http://www.victoriousintl.com/new/resource/files/9499044467.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/h5h0e7ft1cd7nekiqnojkkadu0/56473343386.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/bijusigobotifirularef.pdfIn PDF document text
    • https://lemanssrl.it/file/nolaxewejes.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ddf950aa3---neniri.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1ebfeb4d6e90bfced13d9c1a3403f30b/zijanatiwer.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39044d0416---xitegufunasemuz.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/66147553170.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/f3ac21bd88b152335b9ba9c72c0ef0e6/neximobukimokagat.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4335d6bb0---71210134831.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=that+70s+show+season+2+torrentPDF 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_off0000c80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80F 10408 bytes
SHA-256: 01285247172bc37278f9aeebb1fb7fac1247c853de84e0528f778872c6e8e932
font_01_sfnt_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 17904 bytes
SHA-256: bc156b39400250041af2c0c72de5bf1510bd9014f817b90b27436bcb7630424b
font_02_sfnt_off00010d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1