Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9d530fc8c84d24…

MALICIOUS

PDF

88.8 KB Created: 2021-07-29 18:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 53b95851a82c8b93dba2ef8a3145c65a SHA-1: 238503de46a3063d3032f7326e471fbdc8b6aae8 SHA-256: ac9d530fc8c84d243dd622b116293c3490dcf2286136a7f4b996231ef8b0826e
156 Risk Score

Malware Insights

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

The 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 WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9de1eadbb---novojavagivafozakipoworik.pdf In PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/29693652852.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/34354200096.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f56ad4a9e51c05e42ddc6f2c64ddfea/52038470486.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mbjec9fti3ehnu5tf0vp17cp9m/37798526632.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/79336234199.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/67cl3jqvuil896urq2ul1d27lc/18671571528.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8bb2142b9---gunabotosenejitofamavoz.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/24ea8744ca6a73a7487089029f53dede/55344918070.pdfIn PDF document text
    • http://snsi.jp/image/news_file/3828490701.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609afcc689cef---7491702861.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/85404579545.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/58711297548.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/b2194589882e5e4a73b320b06f4fdb6d/kozutadupibidovo.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/putesogogokovoxewevoj.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/mumadugurijogudat.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/p196uoctski8ikbn455tqslptl/82908895082.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///202179425302906.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/5503775702.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0b98b0b2a2c1b89b0e8ad69c879bb0e4/vodafunedikobogozixu.pdfIn PDF document text
    • https://ewt.cz/res/file/tisale.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/41702891599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+breed+chickens+in+minecraft+sky+factoryPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 11120 bytes
SHA-256: 983fdd065bf1121c22e009448183272d4b5472aaa6c62eb3f02b5b86b6b7a796
font_01_sfnt_off00010f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 17628 bytes
SHA-256: ad257e56b820cc31e9735a7cc54a9318bb8901c1e26cad0fcac8de91391b075b

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