Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec40c4c7afc98b6…

MALICIOUS

PDF

83.2 KB Created: 2021-08-07 10:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20d670e3deaa740a126b84c689708c5f SHA-1: bee583d02301df7a097c4b0574beb9ae32a9e89c SHA-256: cec40c4c7afc98b6081f4f1db4e6c8c5413408659c2ca335ea966ef29829bc08
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95' strongly suggests a phishing or trojan distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a pattern of using disposable hosting for malicious redirection. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2705

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://108pizza.pl/uploads/userfiles/files/xaxulitipa.pdf In PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/tafoposomobunubaju.pdfIn PDF document text
    • http://househouse.it/userfiles/files/65824138174.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/95158965245.pdfIn PDF document text
    • https://majubesar.net/contents//files/watilejapolewe.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/lajezesufolegaji.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df52e0137---kenaruxofipukukumimepusa.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/639fe6b423e5cae77ba5d79df8ead87f/77987414997.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/basajivetu.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/300de8359433e91bf7a3ecacd04e2a22/28638855782.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b75a270ba69---10099064988.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2as1r5djk2esgm9tovlffrvc32/joziregar.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/37476430848.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/doxepubifojivajebene.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/87405caa76a518315559e6a277f43ac2/xotapilegabogufi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3084fg5uvahaoqocbvkt67p3ek/jafujitenifegebimitar.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/jugexevasazobotuvejatezug.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/rifaniwofuseputagevek.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073362659ea1---gitulumitexukejemur.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/4746945165.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6a8fa902e2013c72c6721f16dbee5f62/jufan.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b865caa8d24---rujujesibafusimifonitix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+turn+on+cuisinart+14+cup+food+processorPDF link annotation
    • 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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 16568 bytes
SHA-256: da24307226d814d646fa86bd7e0e409efc3cf8a352bf9f957119c94fec478ba7
font_01_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 10872 bytes
SHA-256: 8ffd2f45acb010a2fc4eaa7e4d169a511e3a1324c771961ce0ef9aab47ecd68d
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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