Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab729478a979889b…

MALICIOUS

PDF

73.9 KB Created: 2021-09-07 03:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d91b0cd9bf1e6223f13a4d2bfb74265f SHA-1: 9b4847fb0bca5e9a0dcf83f5fc93c0cf96f7a012 SHA-256: ab729478a979889b64a38712e2b5262f496444390795b1eeb67a8e0c0327bfb1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a652803e63a---xerax.pdf In PDF document text
    • http://cozycornerexpress.com/uploads/files/fumadowuxurit.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/pobogamaratakezidozib.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/benopibofa.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/pefap.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d86d5bf27---26871016459.pdfIn PDF document text
    • http://siciny.pl/userfiles/file/53216121927.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/zekatenotajelu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/dd3abf237bbcfdf66d7097cdf64583b8/jamudajubutibo.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2d09251278c8659fe3a182a609ba00ff/luvafefevigepuvenagofiku.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c857a8944b---51745852946.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/41554931930.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c57b9093925be54fedcba1ec5153772f/50934109325.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eimu5advcs1kcvmgc62a4rs7kp/pudijufikapukopuxibuf.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/viridujekivuwovexado.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/safivasatuxunetawoboja.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/xojupaxezupufinid.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/zemuvomus.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/lamagodu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/78842737846.pdfIn PDF document text
    • https://kopari.hu/files/file/bifojiminoseledujagusup.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/2522894797cd4ab66fb46b3581740709/73033807845.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c115bd4fb36---mapazule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=krups+dolce+gusto+machine+manualPDF 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_off0000bdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDEF 16688 bytes
SHA-256: 5426451e463dfde3d330d6dc70ee9864b509c7314e8051cb674ca80bd591d667
font_01_sfnt_off0000e87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 11052 bytes
SHA-256: 507b72758f767f61753935d3cf0d03ff564d454933353a027261a11e555ea49b

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