Malicious PDF — malware analysis report

Static analysis result for SHA-256 2467b2d795a8574b…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 08:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd671aa05a2896e3474f10508fb48283 SHA-1: 8cbb4678e121e745d68b37fd4d9951db5941e5dd SHA-256: 2467b2d795a8574b3a94cdd83c5006773a27f90429c2e600637cabeb7f45d9e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely used to facilitate these redirects or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=io+game+sites PDF link annotation
    • http://cateringkieuan.com/uploads/userfiles/file/74544645716.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/30asotgkohjsilsqovel7k20oq/wumoravawufo.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/rogogofutujew.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/demavirotox.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fikomojino.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/75364680002.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/504820bh9qbjfn25l7esq0dhd4/54282838500.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7196acf78---22000939881.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/fizitarapidedodilib.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22573412566.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/17924448417.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133a44f92e67---93414777643.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/wurelusoxez.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/sutavote.pdfIn PDF document text
    • http://xsteelstock.com/d/files/34242237533.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/dexujekunijusurut.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/34505481935.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/kumujufulidilevo.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/37185329638.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/famelesigamitiwujodexedi.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/levedenuzezifa.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/zunuja.pdfIn PDF document text
    • http://asja.ua/userfiles/file/18851087750.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/nabajunevelu.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/popinejuzese.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/botesinonavexasi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ce5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCE5D 18132 bytes
SHA-256: ce28e1772f405b9cf07525d8ef18639cf1e81c514daf435df7e95d70c13c52d1
font_01_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 16940 bytes
SHA-256: 7577c12eb9b310fdfcc5a6f5003c2ef00be99953254220acdb6f09e25d7137a6
font_02_sfnt_off0001162c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162C 10152 bytes
SHA-256: c37e843ff6ef0b81ae811b555494f2661419c0f15c71abbc0102059dc6a0c4b0
font_03_sfnt_off00012cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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