Malicious PDF — malware analysis report

Static analysis result for SHA-256 653b4dc76d4624e0…

MALICIOUS

PDF

91.0 KB Created: 2021-09-01 06:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18fbb2578e8dc0f94789305e4f4bc513 SHA-1: 27022ad882f99189d3da071e0dde0bb695765fd1 SHA-256: 653b4dc76d4624e067bcbcc7d0dc1ba0efe03a934ce84292b78a32ec3dcc9430
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised websites, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kinel-hunter.ru/upfiles/file/minedukoxozafamuvarote.pdf In PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/cac308ba4db94d105abf5075d8385b60/vazofap.pdfIn PDF document text
    • http://progetec.org/userfiles/files/37184262678.pdfIn PDF document text
    • http://parentini.it/userfiles/files/22983054575.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b77b6e9a5ba---61972433703.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/rodukupogefuwokivuxufero.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/56acad4e42e69de711aaf63534d50c38/54469522972.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/44536472821.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/31924671732.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/kurawixinugej.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/sigenasiri.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/latujogozajigijegip.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8e9ed13a4---xobanikusezejofimulegof.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/22583551722.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/59055647078.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/68f82338b59f2f9943a13d53d2db4489/14601559836.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bakokejisiwujezipiloraz.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/99617454911.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/94373189994.pdfIn PDF document text
    • http://amesonsofallen.org/clients/53156/File/buzabuxirisibusekitu.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/sosires.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/razegogawasobesoxuzefijo.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ee42e9d52---32130333579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hsee+answer+key+2019PDF 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_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 10488 bytes
SHA-256: 489650f4919ef23bff65ffb2256d4591dcc2dc6e28b69921c325e947ec5734e9
font_01_sfnt_off000115ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FF 18480 bytes
SHA-256: d6f2d34fcf381dd63ab895938ce0d0b829d949d2c69a23dfade8646a4090f4b2
font_02_sfnt_off00014607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14607 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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