Malicious PDF — malware analysis report

Static analysis result for SHA-256 20783d7474ecbf0f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-16 09:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db64b36f97313cf27ba42bd8a5d4b647 SHA-1: 4c1ce90b16cd708cc20b1776d67d178793d980f6 SHA-256: 20783d7474ecbf0fc9a48d8d9a9ba6d24b403829e82f8c403158cb99cfffb36f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is classified as malicious by ML models and ClamAV, and exhibits characteristics of a phishing lure. The document's content, though heavily obfuscated in the provided excerpt, is strongly indicated by heuristics to be a recovery secret or private key request. It also contains numerous external URLs, many pointing to compromised CMS upload storage, suggesting a distribution mechanism that leverages compromised websites to host malicious files. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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 https://pixomot.ru/uplcv?utm_term=how+to+reset+mobile+phone PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ee3a17da6---984743745.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137556a3b46e---78453917521.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/fadik.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/lexabo.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xaxisulodatapamaxodonuni.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7332150ff55db7a7aa04bc9fe28f5325/89237525696.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210907_153259.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/68679814235.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/31179944020.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7e1153b9412fe312f93e77373ec5605e/76855232361.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355a0836b6c---1254726539.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/pojafumatoxojuzifaj.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/17727215791.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/97327726149.pdfIn PDF document text
    • http://moristas.com/userfiles/files/3828826118.pdfIn PDF document text
    • http://gibisch.org/files/files/81275779916.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16142d02c15b2c---3748144191.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/votop.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/97111586476.pdfIn PDF document text
    • http://realestatemiami.com/userfiles/files/surapazedesupepedoka.pdfIn PDF document text
    • https://vanphongphamhienluong.com/upload/files/81137766928.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/67532845520.pdfIn PDF document text
    • https://eco-translation.ca/upload/editor/file/9478583083.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12102391549.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/66581492276.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_off0000c02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD845 10572 bytes
SHA-256: d89e7c10bbbc09c021ae246f65857fc51c8187d85108c7e9358c114684a4efa1
font_02_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 17208 bytes
SHA-256: 122f0cdc760f3ed966f70f1653703a08e2eec635a9cf1f6eaf734c215a318450

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