Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b277583c47bd3ff…

MALICIOUS

PDF

94.7 KB Created: 2021-09-17 01:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: df1e60785f5f1a39ca1b5e1c8446ab69 SHA-1: 20784985bf6cef8fd67ea6b1971864a62c57daec SHA-256: 6b277583c47bd3ffdc99b876bb64e9cc66fcaa5b747d13d75c838093e3e7c91b
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest it is designed to lead users to phishing sites or download further malicious content.

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://smidgel.ru/uplcv?utm_term=arnold+escape+plan PDF link annotation
    • https://hogozaty.com/ckfinder/userfiles/files/gulis.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/wajiwobuzoriluliz.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/zewijide.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/52784019423.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/xolopasamuvodafeso.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/55733780206.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/datapipaseted.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/99935128205.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109012111259767.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/73991314146.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/58271290987.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/93454222846.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/9b5fbd4848599103c4bedab84298482e/notamet.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0c55d0786fcd39682c57b2c70f2d8b88/vazugezarim.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440c15429d---xelugesagoxoluzeluti.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/11550902527.pdfIn PDF document text
    • http://rajasthanmetals.com/userfiles/file/30701945385.pdfIn PDF document text
    • http://cocoal.com/uploads/file/99037860513.pdfIn PDF document text
    • http://billsky.ee/files/file/88288170562.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/xegomabosabowabazukibe.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/39566884600.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2cb33598c94120646f43bcc699a64108/tapapilorawogomuvoranez.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/desum.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/jaduxegumema.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/sowuxo.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_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 19064 bytes
SHA-256: e56c8988c4db7d5a48609c6501c8d1e367af6dbc195e38f2bae17adb9a0d65be
font_01_sfnt_off00013daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAF 10296 bytes
SHA-256: 56d6b2e3d415619fe0d6eb5691b03d069b38f87dcf5d1806890b1c0758e5b2b4
font_02_sfnt_off000154fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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