Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a4771233560191…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 17:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9439eead2dab8f95f564d5af486392c SHA-1: 514e9e058f198656d159292696a8c6f9816cdef0 SHA-256: 41a477123356019121dd17a66a447d393db8265619236bc230e42fbc57e8df30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting. The embedded URLs suggest an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://perfumes.dropship-tracking.com/userfiles/files/lifizojujupef.pdf In PDF document text
    • https://riwg.in/userfiles/file/95921123193.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/46840838871.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fd772bd69---82308873978.pdfIn PDF document text
    • http://specialcats.nl/media/files/wujavixujofofup.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/rofadipubamefamikab.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/18364134360.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132675e972c5---wadaxidimiteninet.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/vimag.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/xazizopadetizovomupaxefa.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/51719495081.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e21e1ed10b---44219499268.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/gapalowolarolotonapume.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/16958773760.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/12197070747.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/gutikirakizikoladovafu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614a3067a2fba---96447729878.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141ae4a1b30d---subizumolo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/1960546895.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/govijogososevunesaj.pdfIn PDF document text
    • http://hadt.vn/upload/files/soridepoxedesafuwitu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/22099275264.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/zivotenedukopuwuberunal.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/tadumebalo.pdfIn PDF document text
    • https://tipresentoio.it/images/file/49276535042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=play+store+change+download+locationPDF 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_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 14696 bytes
SHA-256: 7c627c080a8a0738df30e0d05355dc8c5b499a3e1f8b73f297606f45624e6aa1
font_01_sfnt_off0000d6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A9 10852 bytes
SHA-256: 5ccfe2af69737157d912b30f7b82bd85dd5bce5e6c4e756c387925f6e8a31b2a
font_02_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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