Malicious PDF — malware analysis report

Static analysis result for SHA-256 53ab10579659b86b…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 07:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eaae046e37e3da6aa1ce09c1c63fbe6b SHA-1: e8aa9511cc9df87c551fbc2328e99d86f4451126 SHA-256: 53ab10579659b86b733035b5902aca29dbc226b6b75e3eb96d1062439b117d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress upload storage and disposable hosting. The embedded URLs, such as 'https://ketchas.ru/uplcv?utm_term=rosa+parks+reading+comprehension+pdf', are likely used to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=rosa+parks+reading+comprehension+pdf PDF link annotation
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613365dec48e7---64398674248.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/rorugefuna.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/19726161422.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/78768705933.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/zasepoxirepalowi.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/temepom.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/74886711889.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/fexojubam.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/83171298380.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/d60c6a680e6f3eb707bf88af4fef53c1/magazomuvewafarate.pdfIn PDF document text
    • http://iktoktatas.hu/files/file/26434328328.pdfIn PDF document text
    • http://sjhtractor.com/d/files/gajarinodotov.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/bowamifiredezurawebu.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/guxipiwiwapewizuvokitugo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430d5c329a6---96891256462.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/pibuwixavorezuverujilak.pdfIn PDF document text
    • https://baongochoa.com/upload/file/61720893990.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/98535242723.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/73576930644.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133373417eaa---towub.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/wejilenozuwogajez.pdfIn PDF document text
    • https://tavio.ru/files/file/bugisabutuwidoxevetupalof.pdfIn PDF document text
    • https://fuoriscena.eu/file/tugenuvidexazofibug.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_off0000bcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB0 16432 bytes
SHA-256: abf1d1ffe36610dd98e21ec81bb1bee61b4c6a8c9a7fbbb9decb3fda9aa53ed8
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11060 bytes
SHA-256: 22f9ecc02bb796260c412a8cad5e3eb5cab57d196989318f0fd5a88579d36e09

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