Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a868826aab38563…

MALICIOUS

PDF

95.5 KB Created: 2021-09-05 22:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b37e840b784502f531ca3fd368bb4481 SHA-1: c3740e1d817050af1271db3d77c1ff0c9187ccf0 SHA-256: 0a868826aab38563421baee721c0432040ed25a7ff9a6e60cc792a165bf5f016
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload directories. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.passion-rnd.com/upfile/files/2021/07/29/59712255103.pdf In PDF document text
    • http://nrgmedia.hu/files/file/wugapizipimebukigi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df75d0bc836---70196331509.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/71540259557.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/pilifapaxuporamajuru.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d5439f11cecfe8dbb1a9b1d976d449af/nosapaguvetevijunolo.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/zitowifejalib.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/1704780942.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/99580581405.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/ea13af645c4c25a56a473c3e39ba8b4e/gabamogugef.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/3916111252.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/dbe87fa9a51daff75f4792a6ea69cc45/45016710700.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/xemadesuvaleda.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/69436949105.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/zupanos.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b9f603b87cf98b92d267d50758cc238a/zotozawilitanaxofogupori.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fc48466b7c1---doxivusud.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bed51de9fc---pazimuwofezemuvafuriliru.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f62fbdf04.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/kisafuweg.pdfIn PDF document text
    • https://brakos.it/file/83666491138.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bba29c1c48f---zisozoxem.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/serulebaburosekenajajemor.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/39012470506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dexcom+cgm+g5+user+manualPDF 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_off00011049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11049 10720 bytes
SHA-256: e8b5761436c608fb24f78597b10f0a8efac175c949e35b305fe0a2d75f66a68f
font_01_sfnt_off000128ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 18300 bytes
SHA-256: 1c54db86bbb5025dfab07fca85cfa5c94bc878c080f10e1298bfa7b803482f13
font_02_sfnt_off0001585f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1585F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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