Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d84aa0211d2289…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 16:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 43db3373c8fcbb49836986297575e7a0 SHA-1: cf6d078dd561572c8ddc5713ad30b001e27b649e SHA-256: d2d84aa0211d2289be99f40699280e555347e5e2dd17d6466318a0febcc766a0
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to potentially malicious PDF files hosted on compromised WordPress sites and disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the document is designed to trick users into downloading further malware. No scripts were extracted, but the overall structure and URL distribution are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e3407611---midanaganaguparalo.pdf In PDF document text
    • http://club-integra.ru/userfiles/file/58917330206.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/lokoporoke.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/sojowexivizuxivubujizarun.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/fegew.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/30vva3akp9bsghm17r948r04p3/71769713567.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dikoviximaxapu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/inqqk9uheh9vt9e5auncucs1m3/80142873627.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/gatozas.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/timisaletagufekajixikugi.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/goohtd8f6jnris0vr73emrklpq/13112862167.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rsav1b6j7u90t4k989g5fq7fn2/88111113200.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e91de0f065b19d1033b0e46452f24677/lonaw.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/givaberunazetuzuguja.pdfIn PDF document text
    • http://pronobile.de/catalog/file/takiniwi.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3583f26a---suwetiwu.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/lizip.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/21958c8dd72da3c539ff59af6ca11898/rubud.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210614_210436.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161294689bd304---63714117154.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/xebovaleponozubukofe.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/61186143342.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/t3520an55meuqqr0j1jksunics/togebivemugep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=pdf+editor+download+pcPDF 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_off0000da0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0D 18772 bytes
SHA-256: 5adace3d9ba0ba1397b0a937d381383ec6bfe876a8fe2ec619c6909d06c3bf80
font_01_sfnt_off00010b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12355 10532 bytes
SHA-256: 266367b8830265c938c5944428c5ac64b690811139e149a42cb59015e6953093

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