Malicious PDF — malware analysis report

Static analysis result for SHA-256 c410cf8525347f9a…

MALICIOUS

PDF

98.0 KB Created: 2021-07-31 02:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8939883cbd114a42843f2ec667782e16 SHA-1: 8108875baa798d01522735917cc711746920b3cf SHA-256: c410cf8525347f9a57b1cde97da7485fefdf315a70234501244eee668ff15690
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites, suggesting an attempt to distribute malware or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings further supports this, indicating a tactic to leverage compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096d38dd902b---xonodakulizopof.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c386919753dd716d32fae042ff3c5c99/lowivisove.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0920b26650d2e00e3aea2783e50aff04/48685069381.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/31558804822.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/09fb902b45a7f31aa465588880c099c4/fibinewivagokesugizufumu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/b0fd2d0l1v1mfcaj2mer1krjdh/81352824283.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3bf18789---molonagurefolixalewexe.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e489a45ba15e71b9674b74d5c82fe63c/64233512976.pdfIn PDF document text
    • http://gtshotel.it/images/file/83658451768.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jscdusurpkp3mtaqrmgmtthqji/59506364963.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2803d30834---pitolupuvabula.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80623de8c9---87486656929.pdfIn PDF document text
    • https://italvaping.com/file/55336746341.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/c44f1d229a09c668e1866bfa7b661c12/30943145085.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16085f3cb2cab5---47157601797.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16089b6162da18---moridogur.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/suwalilaxidosutofomuwab.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/74482161128.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086b513eb528---31652694146.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/4289473d81d1f2715a460cf16f3708f5/9488466163.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/90e0cd2d44334ba136186f553b030cde/gubivemevef.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/28011833440.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/vimude.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/8e2d8694db6d40d44ba9ed08aab4b202/limibela.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/vakopobasudazijabet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tamil+new+movie+download+madras+rockers+2019PDF 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_off00011852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11852 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 17632 bytes
SHA-256: a1a350a25467d2edc9659fef6bddc32dc2e6824f9cd838137cbd9f83e48ca322
font_02_sfnt_off00015efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EFA 11100 bytes
SHA-256: 0a4b116c08d16db71b688c0734923b6b4e799818cf98e7bcbc5ad7d97581abed

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