Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd21a056d74d9c19…

MALICIOUS

PDF

96.6 KB Created: 2021-06-28 01:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 222da889b315bdf9fc3e4c543c7c0285 SHA-1: fda13df9fe9da326c491af8f9e464c74ff7194e1 SHA-256: fd21a056d74d9c1942c566bd725da370657e506bb24c10cf23c1dfd03f62bed2
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple links pointing to compromised WordPress sites, suggesting an attempt to deliver a malicious payload. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mkqh25clen1bl3rhq4s078uf36/29789478511.pdf In PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/fn0g0d6i38793gl1j38mpc3lv0/13467508626.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608467a66af97---ralizet.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jukejukafogebabudoremozag.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b9e683f08---66498519524.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021050221441173499.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c089e53264b---32163216612.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/pezakatokiwajelewar.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/74219109230.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f40d74aa6---63870718254.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/5593f12e838eafb54515b7a131717199/84571704002.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/tqv8v8oopa9oeju9ie32dntr6p/42197829809.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/20082444605.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f27c40f7d---lebujufapakofigevenabix.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083ca16b82ba---44647824911.pdfIn PDF document text
    • http://flirdining.com/uploads/files/26696103245.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11ca092170---rewawavejenidutibigin.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/nakalodarawekuxuvu.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27d2a7bab---pulab.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf5a29e130---96171110526.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/81494864053.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/kitibiginubomulisudejaja.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/bavemuzabodizizikakivi.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/tusewuxowagabuta.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086435d6cdf0---58767751735.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ce10r5hetvpohqn4lgoa4k46g2/fukikato.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=el+ultimo+deseo+the+witcher+3+pdfPDF 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_off0001099a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099A 10960 bytes
SHA-256: b64ccdba0ff5f58a4e002ed8dc3ec1da47de7323cb6ddb97b3aeda0ae01df190
font_01_sfnt_off00012319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12319 23256 bytes
SHA-256: 4a7cf0a837592bb2f44ca764ef0f1257d8808964d9b064371c1fcd9e2ccad249
font_02_sfnt_off00015aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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