Malicious PDF — malware analysis report

Static analysis result for SHA-256 30aa7fc8c63b5fbf…

MALICIOUS

PDF

89.5 KB Created: 2021-09-07 21:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b515085717be7a066e4a17657ccc650 SHA-1: 5dad8c74f5b2aa6bfc0a1fcdbae3d05f865f6a2c SHA-256: 30aa7fc8c63b5fbfc9840131d730f49e6c386678d5f259e5f8012422be8fb216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or distributing further malware. The presence of these links and the overall structure strongly indicate a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://philabc.ru/uplcv?utm_term=conectores+gramaticales+ejercicios+pdf PDF link annotation
    • http://coming-c.com/userfiles/file/17567243775.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f6a973807---59010515963.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/bosesibafitugubusow.pdfIn PDF document text
    • http://uhli-janmaria.cz/userfiles/file/fokewowabadi.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/n1tiokp45fi3r66nrpmu08u7ua/11878197341.pdfIn PDF document text
    • http://briztravel.com/upload/files/77243110245.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/xowikigarubesufuk.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/73309304733.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/dokamifiziroj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/a0es0gll1vsvlbb7a9a8qe7hd2/tobesizagifiwogapulaneve.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210628_C29267D7E707EDFC.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c3c3755f3---54370229869.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/zatakirefelisunuwa.pdfIn PDF document text
    • http://houselandia.ru/files/geruguwaxililuzuxopane.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/jivipef.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a29815793e5e851495228763fbca3215/pekubagusasidezubevive.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083b4116aff7---83433206031.pdfIn PDF document text
    • http://foodchemsino.com/d/files/jimavusotizijes.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/kijuvotamelak.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/83996943099.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16104ccafe25cd---sifelopomunobevupodug.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/midenagiritu.pdfIn PDF document text
    • http://myphammonly.com/luutru/files/runidavajodakinofanupivem.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde2273ad8---15934986154.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/95437694099.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_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 20104 bytes
SHA-256: 556c893fddaf20fd10504ebffc757923090a5f35cec6750c98b891294cd0cc3b
font_01_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 11124 bytes
SHA-256: 22f242f4725c62d5eab5db4f12d8d954b61d901874c75b072685e51287fd7a4a
font_02_sfnt_off00014060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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