Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaab3dcfdfaa9771…

MALICIOUS

PDF

71.7 KB Created: 2021-06-23 06:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7212a0cf21090e2458ea98243a49a982 SHA-1: f6edfb9a711145bff1810eafe00d8681d6bc809e SHA-256: aaab3dcfdfaa977125e231f8521a516e7d7292af0269f3d9606b16c17a475179
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://irlanc.ru/uplcv?utm_term=la+luz+de+tus+ojos+en+letra PDF link annotation
    • http://thaoduocquyhiem.com/userfiles/image/file/20355581067.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/6t1oa9u2qcbqkvggmga6hbe0g0/vezatupebivufuxufirogu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/wuruzukifiwelazajenin.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c52d375819e7831954d5f4f2a850536c/88723644999.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c52921b2b0---pudopilopajewa.pdfIn PDF document text
    • https://aromamarketing.md/img/files/doloselolafijukarideta.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087c25726430---nisakovibavadejixujiwez.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210610/file/raromazaxumebobusuwowo.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/86109141b0cbc612e2af486bbcf56dbd/88624731511.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ffca1e274---91087329354.pdfIn PDF document text
    • http://goref.ru/files/file/40469272394.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6a72ef76f4914dcbbab99cf16c8c8b3d/koxeju.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa81276580---36273485251.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/32508824670.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34668478227.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/33023145121.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/12580223477.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE41 3984 bytes
SHA-256: 16b9ef255dc9e28a3a3b997ab3807e9b7e7dc7345a0df703265d69ca40ee521c
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 4720 bytes
SHA-256: cee5c32c6be67abab85819ca201c08aa6e06f7594fe16e969f50cd6de0e91186
font_02_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 11544 bytes
SHA-256: c4d5200e3a8cbfd2cb5670cd7d7dd63f3e3aefe539b2b8fbbf1a0289b950e3f5
font_03_sfnt_off000101f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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