Malicious PDF — malware analysis report

Static analysis result for SHA-256 baef3ae8ce2c7bac…

MALICIOUS

PDF

143.3 KB Created: 2021-07-02 00:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f438a4861932a2367997092074f1469 SHA-1: 19730aaaac1d7ae8068a80b124cec44d52284e23 SHA-256: baef3ae8ce2c7bac40d1bb71392f2a4bde605225cfbb3551605d5e3dfc5f8183
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8107

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 http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3b51de47---wuxal.pdf In PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/jp1d13ecbfvjemaoolaqchi8r4/gexegodu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/f3db8a466aa0a6dd8b325467e57bd78c/mewed.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/085103f4a0f5e57f61a2c71db1d7b5fa/julifiludogo.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/89360526452.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/nizojunuvopufuvipi.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/r2ffbt7bvdm5bqjo3gc74bckpk/bokozepegipukivi.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/jepenoserakuvevoj.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6650c4b08f---fizagure.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/960a50b280a11808aae190744b3ccf27/83866383611.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/66024670277.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e64874efbac764bc2e4ac731f388890a/31304996459.pdfIn PDF document text
    • https://herfection.tw/upload/ckfinder_temp/files/20210630112315.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f05750ffd---jikikup.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc1eb6baa---43022414006.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/lifewubivopufixozefuzus.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609418d887811---jaromexikorud.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/63404194502.pdfIn PDF document text
    • http://madison62alumni.com/clients/e/e8/e84cd6a5166dbe8c5f6852bff763f4b2/File/nodikefana.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c970debdc9b---5919981060.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/94852787307.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b55bb986fd2---16310483963.pdfIn PDF document text
    • https://arerp.kr/data/file///18315925368.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/xilovuzukigizanipinosafe.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/tutogeg.pdfIn PDF document text
    • https://plasy.com/uploads/file/2255337884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=meaning+of+stem+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001752a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1752A 29084 bytes
SHA-256: 7126ef4b585e145e1fe36d22c118a24dffe971b9e1e10ba19fefee3fba88ccda
font_00_sfnt_off00015d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ac97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC97 8260 bytes
SHA-256: eaa07e9ae7fa60f6a7c2a363e33f7a53a298e96e98be49e0721048a02150e1fc
font_03_sfnt_off0001c7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7B3 10552 bytes
SHA-256: f3905d8ff6f4ce2d03f5021417d2bedb18ea8f8ea124854013c295665bb2ba08
font_04_sfnt_off0001df88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF88 34028 bytes
SHA-256: 7b653d16c87fb40ec6fdf7a1c6aaee8699a85c16cac318850c37df5b9a4fdc0d

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