Malicious PDF — malware analysis report

Static analysis result for SHA-256 15e6a8e8071382f4…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 23:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac3257b58939e07f71791afb2c085d67 SHA-1: 42cca7d15e9c80c363077f20cc9ee5eede6fba47 SHA-256: 15e6a8e8071382f479d893d09ddc00d8829201e6b4564dbbf2250a1e7ecb5fc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The presence of link farms on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f63b2740cd---72852953188.pdf In PDF document text
    • http://panziofabian.hu/fck_kepek/88409449076.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/xazopinuvepikovi.pdfIn PDF document text
    • https://argumentua.com/i/file/17533318193.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/m3cklao8e97nl0npqgis7vqu7i/74054224357.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160983674dc220---51506796812.pdfIn PDF document text
    • http://sdds.be/userfiles/file/35955637297.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/difuxudajubapuzobupobunu.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10005746217.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/45403597436.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/kipuveri.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/29024594582.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b6365d32b1868f89d6353df85202f30a/73809144991.pdfIn PDF document text
    • http://beiks.info/public/file/bomudurototupafofu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160943e58136f1---66406510252.pdfIn PDF document text
    • http://riversedgefm.com/files/file/dinazines.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/pidogi.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/d7p8kutggskuvemoc7elq1e7ss/nubimubupalifozokefafu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/tirotanobanuwanoli.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/14012852032.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786fe8774a---92139904762.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161631237.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/57287323404.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780c772b9ea---2883569225.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=prefabricated+wall+panels+pdfPDF 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_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 17556 bytes
SHA-256: c35ff5c1361db4de15acdb93cbe9326fcfcc54d6b029a8d8a02358ced34ec3f4
font_02_sfnt_off00012c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 10720 bytes
SHA-256: 6dc9dbdb2e966c0eff75697b75dcae088c2cdfb46d1836833597a5cc61dcc1be

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