Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc475db55742a78…

MALICIOUS

PDF

78.1 KB Created: 2021-06-16 17:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: cd7519c68762c53727b46490c28ff5b4 SHA-1: 10f005b7630b7c129b92c9b44c757c18a27f0e90 SHA-256: 5dc475db55742a78a8b7552fb60cecea2b5b69291ce3f5d10e861312ab76aeda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress sites and disposable hosting, with one URL explicitly mentioning 'barron's reading workbook for the new sat pdf'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://chcial.ru/uplcv?utm_term=barron%2527s+reading+workbook+for+the+new+sat+pdf PDF link annotation
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d22a68509---mosixofunafutepigadufixa.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/7940990360.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/gonikipopumiluz.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/visewax.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/51352584446.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/c37453b0229174038b8a636779039245/dazinakewodeb.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160900097229d8---83586223674.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6436b2dac---kumasudabek.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a073ed550---23930785801.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/1689661038.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b81aaeadef3---29424072670.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/wuripi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076235bf25ad---48796801986.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/tixedarutaxedukawusulunej.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/69258583448.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5652 bytes
SHA-256: 9b64ef6be2bd597aedd5ba926df85b5531123575af4ea56c9ecac3d79ca69056
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 10972 bytes
SHA-256: 4d69faa3079a2c66eb20e62ccdf71702ce8b9b25aaf784288d6ec5c5a4aa3f37

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