Malicious PDF — malware analysis report

Static analysis result for SHA-256 3619838c40ed38ae…

MALICIOUS

PDF

98.5 KB Created: 2021-07-19 07:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79758bb2831870c0e6ae34b9c2e09c53 SHA-1: b36660b73c5069bfa265e6365dd0c5d5c362e4bd SHA-256: 3619838c40ed38ae4a2b942f75067cf5272338176573e5cd08849511e9799301
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f98949876---18228386687.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2035dcf80c90169210d384e00c3769cf/pugupurubexudeli.pdf
    • http://alpha-cp.com/userfiles/file/lisiwujefamiteliri.pdf
    • https://liniagdanskzydowo.pl/files/jukikogi.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef87f8ed23---tezozib.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdaa303e8976a4cb3e43d2450dc947a9/36621604995.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/bosijevikuniwof.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16088aaf58558f---dasoxajez.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/9f5c887b11a57a212405e53ad7762a68/dazezel.pdf
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/26326445534.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/29883546151.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/kt3mvp6e0iat79mm7vdh00uinq/81283379532.pdf
    • http://classicalgardenstatues.com/uplds/file/mulukotopebaxi.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/7e3nlq2bctiof23hbpjn3dpoa7/79120183960.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/dukrn8lm7olmng3h2ad9itte88/90370853251.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb983fcca---57444621602.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/530b0d4a11d4387e2964abfca04286b4/sozevagegi.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e931764e8---10084477234.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd5e6a27b5---xegowetut.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3195a09465aa2b9a8ce2a2ed444d3bea/duvazakibojefibozefepebi.pdf
    • https://arvikabc.com/images/uploadedimages/file/77743425448.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/jmin74od8pl87m3fa9s4ckubjj/3308507146.pdf
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdf
    • https://autosaloncenter.com/uploads/file/37907531427.pdf
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/3089709113.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608183d4dd121---zexodidejegifodamepi.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/671562f78ab2b2ed50111eb570778f19/39843898884.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=not+assignable+to+type+intrinsicattributes
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010356.bin
cf48b691868a259c9a47f330077ef157433a70b9d03653b9765cd482506ba2f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 16300 bytes
font_01_sfnt_off0001194b.bin
1eb679c2d5596d7c4e01a8258cc54d8b10a4feeba9881886f96ea8a2552c35f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 18348 bytes
font_02_sfnt_off00014a5d.bin
7f140e32f4ad295cec3a448a0f6ad5a98e3d774457c030041afad3a330f9ba10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A5D 10880 bytes
font_03_sfnt_off00016380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16380 16792 bytes

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