Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3e2cb0d3e2b16c…

MALICIOUS

PDF

92.8 KB Created: 2021-07-25 07:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c2007abcd08a54b335f2046478eac901 SHA-1: ab9d3f45f32a7f7955ade960dc1611e8191aa401 SHA-256: 1a3e2cb0d3e2b16c57f1dd09148724e2fcd1be47df5086ca435b535286e73b50
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document's structure and embedded URLs are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/7933f4bd667fff2d7144ba010404d37e/81906462856.pdf In PDF document text
    • http://foodchemsino.com/d/files/nuzagep.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d04020e---rozodomafazoxizuw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/cri236eu4tqoui13jumc97be72/tevebalafumuwebot.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/74304908796.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf79af002e---rinawilefibigedudi.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/1824709682.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/42621297125.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc4dd964e0---51846313673.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827365e3692---92168598577.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096bb773f33e---lodexulivivopixenurovi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/paruzekisubizodofuwuvufuz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f178099b22---betudowobobi.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ba3a2441---51732093713.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/5537451647.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/figabawejesuz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/6bd519f99fae6429b3fac11a1c36f422/totavufutamapikupujise.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/bonatoge.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/04dfdf6f270aa5dbce1d36f2875f6a78/95290435805.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/95f89f61c5e63ea0b664c0886b71c3cb/45666145632.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/30022740308.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13db05b419---fajifuzosajojape.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/609hclo8g6b1b8eobd72rg8i87/waxugelexozotuva.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2fdae1eda5---jufosovukexutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=formula+de+desviacion+media+para+datos+no+agrupadosPDF 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_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A60 18600 bytes
SHA-256: 098860c36e3d3759cfa4b9260c1ec160b1f47c2f817c77186215f50c5cf64659
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 11000 bytes
SHA-256: 662bee2dbea3138ad3072486f6af39743620ee82910e13db9855b8e77d624de0

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