Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfc7cfa6204a3f0…

MALICIOUS

PDF

90.8 KB Created: 2021-08-27 08:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e66bf71ea02bb250055553a6bc4f2f97 SHA-1: 161a5b4ff0abeb750d7fbec8dcc61d0c77c5e953 SHA-256: 7bfc7cfa6204a3f0a8d975c0e46714bf38d3a6e376c8975216abb94460963db8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute further malicious content or conduct phishing attacks. The presence of these links and the overall structure strongly suggest a spearphishing attachment or a malicious link delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611a5a0422fe5---49254696106.pdf In PDF document text
    • http://rydelko.pl/userfiles/file/gokedazujixogagized.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/79461999125.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/gezatotofojeli.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a9401cf3ae5---zipifek.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609361bd37bb8---foxisoxanipejixanasezala.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/28577411515.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d492472cf---fejagilologurojobel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160d276020e7d0---matujevobolilokowod.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/lorasifiv.pdfIn PDF document text
    • http://temple.mo/userfiles/file/77773957395.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160703337d3a1a---vubafubigilolujezivege.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96e22ca85---zalujut.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/giweminufos.pdfIn PDF document text
    • https://panama4d.com/contents//files/52896492907.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/koxugolovaxokinuvifef.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/33364427148.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/40522553700.pdfIn PDF document text
    • https://digireg.es/upload/53915451382.pdfIn PDF document text
    • http://xzass.org/ckfinder/userfiles/files/93326258916.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/7b2e62c6df322284eb9eb3cd162ef90e/95657397547.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/vifoge.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/denub.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/dewebogunofafaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sometime+in+januaryPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00013f88.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F88 18416 bytes
SHA-256: abb7a8c3a5a11356d0e3f4f217d69dba330437c25af5f3bcecaebc72fd251c43
font_00_sfnt_off0000d3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DA 10476 bytes
SHA-256: 54d4da3260a0afc72c4f17f5b7b2ca2c71f197115daebbf3bb1af1fb6a3c7cc9
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 2112 bytes
SHA-256: 488e4e4982a284ecc8482a0a7ea268b5e74ca6588834244d3d0404c1c73fcaf0
font_02_sfnt_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 19176 bytes
SHA-256: b7c2893d50789871cea0c15573846ce6fdf00840e65f5606ca57bdbd599c3cb2

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