Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8f3071b48a060c…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 06:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0b1c2f2f04e804695c565563ecb9860a SHA-1: 8c866ce30e34b990443538ffe6f81fe2af90de95 SHA-256: fb8f3071b48a060c1b711af564ca90cd9887611fc3ac8bb599dc1494525637e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate it functions as a link farm, likely to distribute phishing content or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://allytemp.ru/uplcv?utm_term=4+letter+words+starting+with+ch PDF link annotation
    • https://pensionradvanice.cz/res/file/takimadexadejegiboko.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/7113077456.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/56374322197.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/sovopuwimilisalagivawu.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/69642382747.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109150111274882.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/ronamozosabaru.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/83107072130.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/fasaposobifexawodolak.pdfIn PDF document text
    • http://stylekd.ru/files/gegewaluvi.pdfIn PDF document text
    • https://songhong.info/userfiles/file/29339235913.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/3613300137.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3fe97deb2---vinajafakapiwaf.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/kemubudakujusejep.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/32993865424.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/10390369367.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/zidafojevudoja.pdfIn PDF document text
    • http://parilka.by/var/upload/file/gorel.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/74be34bd4a9cadf30c9283533f77da55/44200991426.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/29800424975.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/fapusarawezoragi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136028db69d8---83336106140.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/86063087831.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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 16524 bytes
SHA-256: e00614fb6faef2579780e1db2cd67b5d91164eeefd1fb59d350b0ff35892d767
font_01_sfnt_off00010206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10206 10716 bytes
SHA-256: 4d81880756cbd920966076b87da4c665d080a89c5382535e6e28094531c29433
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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