Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7180bb598ad02f6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 05:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0be566c4af934e5765c5d1b01325786f SHA-1: e499fe8b0e7a46c9c4a28ac3278b9fad84b31c20 SHA-256: f7180bb598ad02f6c37a2a3baf8147e0ab866c220822a7115d95cd0507d9754f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to lure users to external resources. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16095fd328d18d---64138779925.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb48390a9---tejuvuduxavogasulivofige.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/25228084784.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/loxojixunuxexe.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608953c0d798b---86715084671.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/fasili.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/sivolidaworotirelaba.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613260327ab39---jitosexadanu.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/m50utlki59h75ri5kunokvps7u/55662869235.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/29530616586.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/61065366469.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/nibafedavi.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/36404601343.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/1280451829.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/zavikojekovigulininov.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/57236134706.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/86438827396.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/11422189994.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/9fedebb179c860f2111855e66829fa03/26105138664.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/munibixibi.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7bb33381c5---lebifewirakavawidoda.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/jafuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=endocrinologia+ginecologica+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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 19464 bytes
SHA-256: ffe65d3d516cf4d8ef57ccdd7968ba8a9cf3d729e120d8c97a94ab1dd5aee8be
font_01_sfnt_off00010e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 10512 bytes
SHA-256: 13741f70622a6be6ce78bb4ca09ae7f10586cda31cb80a584dd7ec02b5fb975c

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