Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7bf638026b124a…

MALICIOUS

PDF

102.2 KB Created: 2021-06-28 10:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b74b6de7d8c1d7c6aedae41afe8f3dad SHA-1: 568d4757db469db7cb7b31d0768b372272d7421e SHA-256: 3d7bf638026b124a0a761dc9cbb1f472d5b0acb841ab8e57cb03e0dfe100cf67
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised WordPress upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest a campaign aimed at driving traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://synerhu.ru/uplcv?utm_term=word+of+god+is+like+fire PDF link annotation
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f09999462---xopimibixojadesu.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/m94at3frikjpc37lqr418glf46/xabotafari.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607375d796b7a---lijekelaxiziv.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/93226721787.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/cb3b87eb142421c716019be24ed97f30/binubufibinerabaromojanaz.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/534a03db30f61f4531f5113e8e66c2d0/kebopeforuxaverujonoxepa.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/jogazu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8f4de4e7677992dad93a176fd5a89e33/3249876089.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/wedusinekulagedirur.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/gapujibapuxufomobodizox.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/72690953361.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/51c6cf2c6f6d893dde7b02340e8a352d/dinuriwibajopinelomun.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/d202e627b63c5644b3c16295523569d9/jirejijepegedifazatodu.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/1f9fe9b54977ef25f8b1755c5e4e5f35/37662552714.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/68112285554.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/17c01583ea02388eb862e9dcd35f2718/22704831766.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/rurixifenapifumawesu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/levax.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16078c76023267---juvupuxelunagudijokiga.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/114780256960983f025b79b.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ea383b15---40392525156.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/80220033475.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/19050893845.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_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 17592 bytes
SHA-256: c960718fa957fe52c4cbe8ed797d4cf317d2407122c703e0a1ced9db1321e782
font_01_sfnt_off00015cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174D2 10248 bytes
SHA-256: 9b65098edebe1ef30c0afbea086604a84fc5650dfdf7b88ae53c6682f3f2f861

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