Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd5c0573712a3cb…

MALICIOUS

PDF

99.0 KB Created: 2021-08-16 05:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 028dbebd6a9eba53dd3402b6613f03d3 SHA-1: b7cb159318a973fd76d3db954d331af3a140230c SHA-256: 1bd5c0573712a3cbf82bd39b09cc0dd71ba491479054807d2af9c0bbfe4af251
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://catamma.ru/uplcv?utm_term=modal+verbs+of+obligation+prohibition+and+permission+ppt PDF link annotation
    • https://butterfly-propertymanagement.com/userfiles/file/53314961401.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/59550068301.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608011d37f4bd---xunisa.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160791b80e85d2---25229284787.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/983616007141719e1bdaefbc85143117/jetoleko.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/mafolifazirokatojilatuwu.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/dapapi.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080271490f19---821188953.pdfIn PDF document text
    • http://industrialdevices.in/uploads/89955648591.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/bimirezatu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b521d41abba---kadadatobiwad.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9a4bb812d---32647432115.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0b9e5cd396dd13a1fce739a694b2e817/19473702228.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ad78cac789f49878cc4ffbe94e4ff3af/navaloga.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051914022458.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/sufiginogokuzeriremope.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/lanexudumepawefivurutar.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107030150414669769dfa04.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/pelitijarunizerot.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/47010135793.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/dinogizapinidixerij.pdfIn PDF document text
    • http://maihome.hu/admin1/file/3994398943.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/lewewimiz.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608788fd099c0---foxuvuxepeluduzixavilon.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/20618018933.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4af1f043a---gekodef.pdfIn PDF document text
    • http://placc.info/up_image/kurifoji.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_off0001192f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192F 19760 bytes
SHA-256: ee8c72945616a755e2a2219b7e08126b759226e78ad37aee60cb84167cbbc68a
font_01_sfnt_off00014b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001632e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1632E 11144 bytes
SHA-256: d8c1a8211c9770ee58f27ab43aaa164f0d688bdd41b89d38da1d133ec49eeb3a

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