Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a24f1d1e71b703…

MALICIOUS

PDF

95.7 KB Created: 2021-09-04 08:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e467f7c667d639de728bf863247e74e2 SHA-1: 9bea7694297cc707b08bc2cfd25604bb09706d60 SHA-256: 52a24f1d1e71b7032d7775acdc69e78a0f040da6752042e50f2af6163ee16339
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or link-farming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's purpose appears to be directing users to potentially malicious or phishing websites through a distributed network of compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=metodo+socratico+psicologia+pdf PDF link annotation
    • https://yuanfuconstruction.com/ckfinder/upload/files/babovenum.pdfIn PDF document text
    • https://langumeistras.lt/i/File/xukemegipivusuvevise.pdfIn PDF document text
    • http://ned.ru/uploads/files/79115528339.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/zufabikakazovafu.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/xamutevakebakaroxetoroguw.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/riwazumuzixipaze.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/xadipazebe.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/47499187737.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0981b238---rejimojurukotazudinuw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc9708a3e2---mixokejite.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609411de5ec38---begusomafemesaj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fb09a7d3b---3529604873.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6cac8c7c581b257762c7dca9593e73db/fejedifefogo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bb09c3629---laxavasosulamukixojuvafe.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/79923191620.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/xuxisurekaxib.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30f8949256---92847719649.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/gerebubixupabagetodarif.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/81406269319.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/sosopofavubunojuwosaj.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/weturezugugetutuzadebama.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/gimuriwatoxexiromunuwib.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9296082bfdd4b89d592d2f6e7e9f1c47/3895098360.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/469f22b319545775613710ad9c9be875/20320159539.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_off00010ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE3 10684 bytes
SHA-256: 37ce6feeae34f0e2ac7804feddf08a0f5867a9958c8fd9da2a6ff8562a06afbc
font_01_sfnt_off0001234a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 20528 bytes
SHA-256: adf14a2af279bb0197719f39f6e85dcb1ba9212674322bc1711ced780728025c

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