Malicious PDF — malware analysis report

Static analysis result for SHA-256 1481f5af6f5d8743…

MALICIOUS

PDF

80.4 KB Created: 2021-09-06 07:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8178e0f87f9e1cae2dd50cf213e7d842 SHA-1: 50ea8e1163b10fdb65f35243659d115b655b935a SHA-256: 1481f5af6f5d8743faf093e3457435fc477c4a321784313d3f7ab72c747ff7f3
176 Risk Score

Malware Insights

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

This PDF document impersonates a cloud file-sharing service, a common lure for phishing attacks. It contains a link farm pointing to various PDF files hosted on compromised websites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://amon-syotengai.com/userfiles/file/sitikodivozamidodufajuxaw.pdf In PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a231da7b---78145865796.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/buzesomebosamurofu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/45823887914.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47a52b9478---82994741478.pdfIn PDF document text
    • http://vin-baietii.ro/ckfinder/userfiles/files/wuruzisofojal.pdfIn PDF document text
    • https://polandpools.com/contents//files/17762240952.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/37128156099.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/18735529698.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/95220585036.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/3a50f503c002bee025f4b0ebe2298afb/30403598007.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/bimonibagesofezuvej.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b44adcd0d7f62bb15de731b2a229d207/zilevufenot.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/c2f75ca1095010e37eb666c684dd329b/95435934219.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/uq9vo631k1bm0nnviv2nntfs83/8187205111.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/salorenexidazenepoka.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/dimupalalumin.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f0e1f89c---mevawedubow.pdfIn PDF document text
    • http://wdnederland.nl/file/goxamotozupas.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef4a3ee1c---33563450316.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/bosodazoromoxujeroxujoje.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/38e223ded53f61fb5c086ada44949b09/46962883294.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fidaruvamofixe.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69931055441.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/4025703566.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/siwaner.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=adobe+pdf+reduce+file+size+freePDF 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_off0000d588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 18088 bytes
SHA-256: 1caed8c3c74cbcacfa53b9c792e82c889a76fb3494ed8f1bca972ce500bbf05f
font_01_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1A 10532 bytes
SHA-256: fb49270b513fbb1feb8fbd1739442f72d26176cc39db21a3bf8875de05079a17

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