Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1281b36b3f8737…

MALICIOUS

PDF

114.7 KB Created: 2021-07-27 06:34:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbca950359d4d81dd2aaa120b1db3c43 SHA-1: 8de351362202a45a12e962252e2df2342d5c5dff SHA-256: ab1281b36b3f873741130549cf5644d1d586d9faf2192993a31c0f3e41b54bcf
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to distribute further malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious, supporting the assessment of a phishing or malware distribution attack pattern. The presence of multiple PDF files hosted on compromised sites indicates a potential chain of infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d92d72c497d7caed29f9d47b22a57bf8/zuzuzusivubigakebuwun.pdf In PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/24972101977.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071303202773499.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/wirin.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/591ca0590109c9a9e7b4abacf9055ffb/13255320848.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/53502047336.pdfIn PDF document text
    • http://imi.vc/upload/files/66315570286.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/92833732219.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8fr7f37huk7dujj8b7kj7rkft2/vamuvomugugoralo.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/bizipujus.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/latodasiginiki.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/07db233afe0001444f883e9785d7f8d0/120543109.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xevarax.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2cc18fc31---kulevatinekeg.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/ebcd1c918650b63c435847cbac0272cd/75678939655.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210715_59549A0E95A4FC53.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/ua38rctjub6djam13hin8ilaal/tomulamokerozu.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/lubalonuje.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/lokipexaleke.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/vojipuzavezixonekopelos.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160762a1dd044c---16992739314.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccdc90264---kamulubi.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/94347883000.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/wodunal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=prentice+hall+literature+the+american+experience+penguin+edition+answersPDF 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_off00015998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171AF 11248 bytes
SHA-256: 1168619fbd83af81e3a2e38f546079920da957247baa2f3eeeb230b3168640b6
font_02_sfnt_off00018bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB8 18252 bytes
SHA-256: 5122dad74018d8ba7bc0ab10ab64691f8bec9148a5439fcee448cfc4cab849de

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