Malicious PDF — malware analysis report

Static analysis result for SHA-256 153c45127101f425…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 12:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 80e91cd20395c1ea12894fd256274fa3 SHA-1: e0ae6655f14bf48fec795a10f6d3db7feeac6dd0 SHA-256: 153c45127101f42502f4f58ac6f3729fe47cc77384cd619398de62c3a37933a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d14495f997---wuririwexedimupipobu.pdf
    • https://abofahed.com/userfiles/file/5302606933.pdf
    • http://cottoneauto.it/userfiles/files/wegapibeta.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6a6bdc5d4---65925752405.pdf
    • http://www.deopendeur.org/imgUser/file/75880038808.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b137782a8cd---39774307293.pdf
    • http://hkt-optics.com/hkt/images/userfiles/file/wujap.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c4f2b9b8f---5397218174.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca309e0b9---66738242440.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7cbf158f205a1e55834efc01b9c13fbb/regen.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080501a5a767---75874535055.pdf
    • http://grandchainfamilyfoundation.org/clients/85333/File/38242111498.pdf
    • http://absigorta.come/file/reniwatipulepi.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160816650178cf---binusubexixediluxo.pdf
    • http://ceomit.com/fckupload/file/58700592477.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/5auom9igob7mhcs2bee5h2vh23/67238066070.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2460809b5e---botasutadolunegib.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094366d02956---7533753785.pdf
    • http://colorfulmedia.de/fotki/fotki/file/57047120698.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b428e70a304---80989108274.pdf
    • http://activesolutionelectric.com/images/file/43364685744.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=world%27s+largest+race+track
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e915.bin
ba1907070c6b8aa5fd8c5df54968f2e003c9c69540014238b0218f9a38e13e8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 10468 bytes
font_01_sfnt_off000100e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes
font_02_sfnt_off000118f9.bin
c44917d6aed0c5a1da2cf1f635b6e7284a618b24ea5c4c6f708344312ccd668c
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16568 bytes