Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c7a2369bc9e283…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 16:06:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2aeecc4f920f2fd478bf1ee9c123fa19 SHA-1: cb75d78c0134244adfd49985d2bb23ff42065943 SHA-256: 63c7a2369bc9e283c1435cc858e4e523ba9e7590c00e832d955ce6be04720e23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with numerous URLs pointing to various websites. Several heuristics indicate that these links are intended to lead users to compromised or disposable domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://encino.kopanramen.com/uploads/files/boxosivulezijesipifawugif.pdf In PDF document text
    • http://nadiadsa.org/userfiles/file/mibilijizasu.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/74834844944.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613301f5739c4---tetodepaji.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210902/files/20210902184644.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109081002044141.pdfIn PDF document text
    • http://xtra360.net/campannas/file/bufowazom.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fodinuve.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/menujas.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/225gcr9ctn5b4ss8ai57jnddju/51244043527.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c86297330---zovikube.pdfIn PDF document text
    • http://iccarrentals.com/files/file/xiweresogoke.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/81012299797.pdfIn PDF document text
    • http://emanuelmlevin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16135137842.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afae6969ce---99862417321.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/61512154500.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/322d22qeikfgsm7sf6bmqk0e5n/56900062182.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/jimase.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/15086835857.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/71348820275.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/90314570887.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/60076911515.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/43776103420.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/41878968206.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb23c6d7b---mademuxutojapun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=like+apk+for+instagramPDF 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_off0000d8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E0 10704 bytes
SHA-256: f48eb8d8a2ec1916959e6b6fd6e27d1bc268a9dea369deae2f65b2f69261bfca
font_02_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 16284 bytes
SHA-256: 0a29580a6ee396097538815fd70a8801292d5aa18783b050287b0801b14d3cda

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