Malicious PDF — malware analysis report

Static analysis result for SHA-256 314c4d09f9a06285…

MALICIOUS

PDF

91.1 KB Created: 2021-06-29 02:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 48e6fcd42dcb5362b5670b18395bdc7f SHA-1: d6098e6fd7587e4aee6da6fadd34aa7beed4f5f4 SHA-256: 314c4d09f9a06285ecde7bd5cac4f14ea5f56331a98be067a2af712d165c63b8
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 URIs and link farm heuristics, indicating it is designed to redirect users to potentially malicious websites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=national+american+woman+suffrage+association PDF link annotation
    • https://ideylia.fr/uploads/file/zoxajoko.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/3if03s4ujv7uc0971j6fgpe1l2/kizevaxadafubopom.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/livupufajoki.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/zojodevufara.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wivid.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cugggic4u5j4oahl57vo4mbojm/78462880907.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e4da3abb---vesedoronizofigipo.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/gorofameloz.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ac5606c69be269b30cb5a3cc841f8cb3/tupifawurodufazu.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65a8ec852---27984822602.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/1kuhhdguc6lqrl42jprs68ohcj/pivezalasofitizi.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/16626469789.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/54628568604.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/rilobi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/5c81c72068d1e25a91497ca0d136466f/24563756677.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b71ef19dfb3---3186271300.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/62641239295.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/fb69ec7a81629d66f94277409462d077/10953413526.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///topametosu.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/cf08845ad66e9f6bd65532a4598d2302/3010995351.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/merilivajijasitu.pdfIn PDF document text
    • 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_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B0 18072 bytes
SHA-256: 94a94b8f4a3f6b17d2cf40a76ddd9fc1d4c4185f4b379666f19256bcb75dd929
font_02_sfnt_off00014634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14634 10844 bytes
SHA-256: a9e87bc1f6d918b2809d742fa3d4f5dd73f314338def2b373f1bae624c7b4e79

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