Malicious PDF — malware analysis report

Static analysis result for SHA-256 5581e14acfcdcbc4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-11 15:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b047e4cb5548db768d4b53e13b6314cb SHA-1: 5b6ddf367c4faaaabed8700aff3089d7febf9497 SHA-256: 5581e14acfcdcbc44ed1ca850b774260e33adc0b0b33982488f02c1755427f9c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cairparavel.ro/app/webroot/files/userfiles/files/vomiminafejebololuzaw.pdf In PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/zogelojulu.pdfIn PDF document text
    • http://boxethai38.com/upload/file/73880112917.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/bivadikilepi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/40756481166.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/77bf86b1bcd9e1851d9d062f79a2b8a2/leron.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/8597675351.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210904_72DBE829D818EF1E.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c4db77a344---lewakupabuwulevukizovi.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613508141674b---96403802958.pdfIn PDF document text
    • https://cqhuaan.myhost360.cn/upload/files/09-01-22-51-29-50.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e2487da0---piwilamuvewudaradojunova.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/mukebalofatoxi.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/vegasefupumisuwe.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/64873758641.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/68872598965.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/kawosemenimebozipiki.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/mekilegoxurivima.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/giluzifozenisitalid.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309007f379e---gizorisuxopozuji.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/xidunimadunukozalubu.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/gufixekebijelelow.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/77506608755.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/95403126325.pdfIn PDF document text
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/66941465874.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/misawoxosuxuleveji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=mobile+development+frameworksPDF 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_off0000d879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF08B 17424 bytes
SHA-256: 8cf0f6e01da5d46081ffbc6e8e2be3ccf7a4edaaf126a5fcf03e92d9b8608267
font_02_sfnt_off00011d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 11036 bytes
SHA-256: 9467148bc8d2084fdb0dadf777672f5f88ddf689646b2f8341452e4c6b204b0e

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