Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87ae6f89ad424e3…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 11:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 674b10d2192af2dcb9156a5c0ccb422e SHA-1: 15821f946b38e9af49d7268395e1839eeec76943 SHA-256: b87ae6f89ad424e3d0c715ff9f8549867d8dba9c28e6bbacff416e4d0048bf64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The URLs extracted, such as 'https://allytemp.ru/uplcv?utm_term=windows+8.1+64+bit+download+with+product+key', indicate a lure for software downloads, likely leading to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://allytemp.ru/uplcv?utm_term=windows+8.1+64+bit+download+with+product+key PDF link annotation
    • http://mientaytourist.com/uploads/files/wotizo.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/22744100032.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/jasomev.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615375e531f1e---30901934292.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210918_CD63254BD490B365.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/xilirazuza.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/pibajekupimubezuvubu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0b948cfec---27243134342.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/ludidefisero.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/meruwuro.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/28454995064.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/zewilufadaduz.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/16802376683.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/piwopibuvazopalojom.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/69schrtqk4i2smvna45ipedc24/21700589957.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/88567626507.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/damirewefujiri.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/kulape.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/42120737594.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/60428771257.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/34440354647.pdfIn PDF document text
    • 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_off0000adfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60E 16528 bytes
SHA-256: 052a2a134eb9715736af6b0166a43da1fb60967bc7ce44c812443d5a04fdb0e1
font_02_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 11708 bytes
SHA-256: 5c623796d2ca39b0cf97d27b423baf8697e7168fbad1958d73cbbaeee68a70d7