Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac66f9894c252ab…

MALICIOUS

PDF

94.1 KB Created: 2021-08-07 10:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 801e29ba8604d8ee49a3b01e3e69c004 SHA-1: eee74905ad606e298cdea93e8af1bbab261916c7 SHA-256: 4ac66f9894c252abad1c7a1509b85e0df6a66b3818919186c9dc79197ed65fd0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to host malicious archives. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document's purpose is to trick users into downloading an encrypted archive, which is then likely decrypted using a password provided separately. No scripts were extracted, but the overall structure suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776c231864---fowinib.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3e6efd4d4c428b320569c2e573a6f79e/kazosid.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/v0q2m72j8a780madb2f76mbt63/vakaxona.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/96490616321.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16079888f844f1---53421594932.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43105dde2---34097064500.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/wunowe.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/lakekug.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/felezowozovulovudajumas.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ebf8926b4---dijure.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/togasaketagaxune.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/2252367.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a4df23f25---ladodazojozofij.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/umhk7t027cu9nbn7qank9bf5qg/21847526649.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/girusifesezasiv.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/29546404045.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/sibobusafanitebexujodemop.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/62520941994.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b163199---givefari.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/91804324624.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34760820173.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/90942590934.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/o6q8gkr5vap5f9ia1nens9rf8o/vixuno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bokutachi+ga+yarimashita+drama+sub+indoPDF 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_005_off0000e467.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE467 16836 bytes
SHA-256: 200686e5cae5a04270f0e543ac38f0a4209c9c90ee8b5ee67339f7c07bdbcddb
font_01_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11465 2828 bytes
SHA-256: 96510c7ce153e6bacf586bfeede57c74c1c00527139a64879f81f2c3cd42f84c
font_03_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 11136 bytes
SHA-256: 4b111d8cac11fe6b605bd05ffb36b03b6d6714be9a19d2d74ce43d91eaf091ef
font_04_sfnt_off00013a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1B 17212 bytes
SHA-256: decbc65eb6a43bc00349b13a629cbb4b86f4a4a30c57376a75fb6f202a43e7c0

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