Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ca4e9b515a11fa…

MALICIOUS

PDF

94.0 KB Created: 2021-07-26 12:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2eb30629b199020f5f56effaaef39a14 SHA-1: 4c5a42ec56252d19357576c923c61a9aab08f982 SHA-256: 93ca4e9b515a11fa15fa9abff43cfc727a566c4fd6ccee64ba16f84fcff3d706
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ghv0celeejavmm534346cb0i76/19754061174.pdf In PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/qredc2orujrtcck20tte0ke5lk/42337699090.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8633735f76---wabilevagipijezubejilunil.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/latopiverekuw.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/bunovobajexop.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b1e3a162---norasurerojilotafimi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6316e44d8cf5fe4660bda50189859934/gigawikemobux.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zumajagegetubisiwif.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/24543328238.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c349735342249e5f826cca14443624d3/35060644123.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4t4c9jhvrm54bb2cup47nme12/sakofulifiwegade.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/wurunateb.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/012115844f1413f98d6cf31652ef025e/luduvonuledutorax.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/0mt0uebm5gel37pg2rts1vddio/65128680104.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/6f2lfsl69sha39csvrm5q4ob8s/sawibosaloxonelexilaj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9bb7a137e---sofovisuk.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/80019329333.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f07d24b51---rakaziguwo.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/1522781990.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/77641321596.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/6f094bb4e2b40f9ee5c438ea0e1c07cf/76625061870.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/51591332147.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=abstract+and+concrete+nouns+worksheets+6th+gradePDF 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_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 11076 bytes
SHA-256: 7832f771ebf73055fd5019b3cdfe860c6551bfc596e10886f5bbd92a973b44a2
font_01_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 17612 bytes
SHA-256: c3fc08a34d76df719995b278482c52c1cb6425228c6fe3f279d3873a4cad4867
font_02_sfnt_off00015201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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