Malicious PDF — malware analysis report

Static analysis result for SHA-256 a27ee2cce9da07d2…

MALICIOUS

PDF

82.2 KB Created: 2021-10-10 09:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1f5957cc0aa26f2d9f24a324a226d5fd SHA-1: 57b351a9b9391c215dbf7bbda593f31a42efd204 SHA-256: a27ee2cce9da07d2c34ccb9e9291f6ca5466060a436f1cfa8d97a8916ecb7be7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or unknown domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are designed for SEO manipulation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://eiffelflowersquesnel.com/userfiles/file/73896629913.pdf In PDF document text
    • http://studiodebiaggi.eu/userfiles/files/jesozarezagadudo.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/99341449014.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/rizopajegulavonelavuna.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/77813899072.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/moduzurefiv.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16148271a46f57---pekom.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/lopazukapefomapi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/welunisiwaroz.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/fixiviboboreluzuxi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/zuxibato.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161620d2810fb5---dixoporogo.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/medixazajujawekuxaxugoba.pdfIn PDF document text
    • https://kimcert.net/E/file/buwurubulolam.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/27713011441.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/bigipisovav.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edecf8d1f9---99566311693.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/76393730213.pdfIn PDF document text
    • http://hoachattn.com/image/files/66100718631.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904115102.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/kevekutotuxolokevow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=herbs+that+grow+well+in+partial+shadePDF link annotation
    • 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10888 bytes
SHA-256: b80039c8bf0b3075883ab5ef92a484967da5dae77cfec24030b21c01e8bf5475
font_01_sfnt_off0000f75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75E 17156 bytes
SHA-256: 2bb0029bfd85a61f5c3f2e8125e8a6b2a3910958080c5b432497e6d0a25bd5ec
font_02_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1