Malicious PDF — malware analysis report

Static analysis result for SHA-256 52383f0616ed86e4…

MALICIOUS

PDF

87.8 KB Created: 2021-07-03 10:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea7430428e74ba1b469def857bb8d57c SHA-1: 35419a8c29d2f2c103ad08ca20d106c98146d455 SHA-256: 52383f0616ed86e4dc6005a5390acacbdb81c9c33a232fce64ec7937346f53ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to websites that appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://bensonlandscape.com/editorData/file/28271376836.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/84vjn8968acdcrpq2pdb69qeod/53819043103.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a3c652f3cefbdbba59eea5d7e4f7de06/2651148276.pdf
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/1vu2m2lnsjotuq65gted7kv1bn/69816126684.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/82a21919153d9d5ad8bcddd2b9bb6931/79411687367.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160933c40dcfda---72871524192.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/71345d81682b79a0e81369b73c8b9789/dimevanenano.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd20830820---50437121291.pdf
    • https://morganmethod.com/ci/userfiles/files/favejokuj.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/e3d9dc94d780532e39c60e8dba2ec52d/95797897725.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b902b68452c---1270170738.pdf
    • https://altinhediyeler.com/calisma2/files/uploads/57402537643.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/648a20049ffcc731ff30f44ab904d362/meneb.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9925d23ef2---55696182351.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52b4648ef---74685243999.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16070e040aa67e---69635869777.pdf
    • https://vildmarksjagt.dk/userfiles/file/44114666081.pdf
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/fefowafapixewezuwema.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d844c8083---90305976666.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160dccd9446987---13678465368.pdf
    • https://airtelco.com/data/users/_/email/files/99565587696.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823abfebeb6---pejolopuvuv.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/82403795304.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3bb1f16f9---39687288745.pdf
    • http://kajsanordstrom.com/userfiles/files/rojejowumeraked.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f416a94e64---duvatekupidamukawo.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/6cf043513ede184a5c4c7452e998e3fa/gaxuvedukaburotagejopufeb.pdf
    • https://soudurelausiere.ca/upload/editor/file/11571423552.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=old+english+trifle
    • 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_off0000f52a.bin
67ecb3372e11da8e329ab04e907513f9bd819eec912c910482baf73786052fe3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 10376 bytes
font_01_sfnt_off00010c4e.bin
38fcc12664451465490fa471477d466684dd88381cfb629bee193e08f15f9b0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 17208 bytes
font_02_sfnt_off0001396a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1396A 16792 bytes

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