Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c684bccb9ed9dcb…

MALICIOUS

PDF

75.9 KB Created: 2021-09-07 23:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7191ea1a527616021f7b36b360c2d1bb SHA-1: 50e15a1c9e79214a6959dc96366abd31dcfc82eb SHA-256: 1c684bccb9ed9dcb496aef93e07f18bf6673ee7d55b75ccea20ba1529eb6a40a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms hosted on disposable domains. The primary function appears to be redirecting users to malicious or phishing content, likely disguised as legitimate downloads or services.

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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0894559ac6fe5cbe433624a282bc014d/kanakenajalu.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/tafajaxixiruremewinim.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f759fdf8828e41c88ec57680f369fd0e/pojopem.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7144a1db---tuxaduborakokunawowijok.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/vikelepewituledake.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/pokewejokimefaramaf.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d492168205---27300676955.pdfIn PDF document text
    • http://slsnn.ru/content/files/78726537021.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/82106227616.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/mefuwinonelepe.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052830e580---67639517498.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/31871535364.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e5999f12---bezigukixubusanosuwig.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210713_204852.pdfIn PDF document text
    • https://shidoremicrosys.com/media/96280268875.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbccf667679---58074551157.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mamini.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/mukupisete.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/iq0lv6q4gupg2qiuptaemuhon7/14130295951.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/93719789064.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/94758561046.pdfIn PDF document text
    • http://cityfate.com/files/files/91384925921.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/zozakisositer.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160788ae067849---guwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=adobe+pdf+editor+trial+version+downloadPDF 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_off0000c7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B7 10764 bytes
SHA-256: b7dddfdb6be37a882f301137fbeb97a98c3454e7547c62d32adf1f777610103d
font_01_sfnt_off0000e072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16188 bytes
SHA-256: babf174cedb54857627c343e65b597fe123d7d3c4026b00c167796c56a29e7f3

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