Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ed3a5746b1dbc1…

MALICIOUS

PDF

89.1 KB Created: 2021-07-24 12:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 28b2264d053cf76fbb78b422701fd16b SHA-1: 6c71265a9a32683a4000aa1a456f1b8f897a7948 SHA-256: 78ed3a5746b1dbc19a6730fcabc73dacc879dcf0209a6521e5839a50ebb5a5db
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs and the PDF structure strongly suggest an attempt to lure users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vpumffm3tk3gmtse9egbgm41vh/90408950362.pdf In PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6543f2ebf---wagit.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/84055730503.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/15804803308.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f80f76d0ec---56300650065.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210628172537_01j2nb.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f676665ab---lefasuxaduvewogos.pdfIn PDF document text
    • http://immopolignano.lu/images/26985896586.pdfIn PDF document text
    • https://linardi.ru/files/file/kerunopidesomow.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/d841f7e5e56a6d63120b9c7db9aaa112/kosepewamubujuvet.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/386dc888b51cd4c490fa3a11b3eea59e/gakekesarabodobuz.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/4306a2c622cd42a90435b8e3cc2742b8/dusunorasa.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/viganudidufigivab.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/e32c73755ae6650b60cee6a7afd22417/16514305932.pdfIn PDF document text
    • http://islandpointfl.com/userimages/27164086822.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/86812999015.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e888959b8---tevawofu.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/74892475257.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609407874932f---wafifelixoj.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/45894800974.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/turukejakojumoviv.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/mogomebipijuwa.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/zemetupifibidalilu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+you+get+back+a+deleted+voice+memo+on+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2D 11236 bytes
SHA-256: 131d38108039959c65648ab36fe4892c620bcc65c5056a60e446eeeba9b1ae21
font_01_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 17316 bytes
SHA-256: 56cc0f8271dbd63678d244ecf613bb87ce8a561745095a1224097899ad5eecbb
font_03_sfnt_off00014d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D2B 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa

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