Malicious PDF — malware analysis report

Static analysis result for SHA-256 a38beea95b682b63…

MALICIOUS

PDF

99.9 KB Created: 2021-06-25 18:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c37384711565c166a5ad6ba098b82af1 SHA-1: 11e2d13ee1f42b0303bdefe7296a32a85d515595 SHA-256: a38beea95b682b634769c877cb172809f0a97089ee9936bbdfb5b2aa653139e9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9781

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35e8646c1---25293325943.pdf In PDF document text
    • https://travelsafeway.com/userfiles/file/20423236111.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/56218841353.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/0ea0e8ec48684c402594de1f724938ff/sumabanix.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/59305184112.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0729139e46c786ca5f23679a65e3d6cb/47103757529.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4kv2fcvbc2k6v0e17fuq0h90j3/68144528357.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/98487558139.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/50467215650987e480e32c93777cfccc/75777963583.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/hmnku0a7qe04ke8edsbeng0em3/19223281923.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c3796c16f60---82179014497.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3f9a81b2544a786028dcfadd0bd304e3/levejudurulu.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/16846839441.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/7208d9f37598ccff49e428c8caead012/83512175472.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d11fb9fb99---786879868.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/2fb83b43d954c07a0b9532a10a1bd467/japogexokimezezazupebiw.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ce76f16d2---daxuda.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/81828012256.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071202a55e7f---391654424.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/edd6bab634fe8fd3393b85a738f3b7cd/99603005775.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/84669632102.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/673fe017282f48a18e34aaf3c11c323d/52819003873.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/85003896391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=another+word+for+invaluablePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f8db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF8DB 19204 bytes
SHA-256: 9410fa4072b78278a160045f532a5c3222054d873be6b19cdfddcd92c04120cc
font_00_sfnt_off0000e07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 10656 bytes
SHA-256: f00e7ce8c8d9f4bd31b051f934d5fdc2a9fef18a0891664a6f4d3f02bcdec0ad
font_02_sfnt_off0001191c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 4944 bytes
SHA-256: e4d047c5645b22f2353f5d5d16e69b970aff5bea874546d19b70e6d7e11c27ef
font_04_sfnt_off000142d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 25264 bytes
SHA-256: fb6dd9c51696da2ec6bbdf6cfb2570dd092f163e5113e93c1f9990214d0319ce

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