Malicious PDF — malware analysis report

Static analysis result for SHA-256 2533c5e25a5ed87f…

MALICIOUS

PDF

96.1 KB Created: 2021-08-06 08:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0ff69332dfb8dd6f563a114600c64c1f SHA-1: dfa28d8da66704711034727c5c26eaf4bf406f02 SHA-256: 2533c5e25a5ed87f86be6b79fbce9711b53effdb135e0ec83cbc87793bde233b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to redirect users to malicious content. The PDF structure and embedded URLs are consistent with spearphishing attachments used to deliver secondary payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://laborke.ru/uplcv?utm_term=the+children%27s+book+of+questions+and+answers PDF link annotation
    • http://yokohama-model.com/userfiles/files/50621652585.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kiwukegigogorolonebena.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/poxumigutoxajok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16088dad29a360---25243728351.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ldmitn47bb135nbhtdbls3t185/rojuxuwugaxotorijat.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0475875001620801405.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/nazutevabajibujorate.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3ef831da---kawepoxakekosorepuwejedud.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wizozufaruwun.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/xavakotolifupezodofibazux.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/33135514405.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/45120759465.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818a8be128---52762408330.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/novaxiralejunozilefovuwi.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/obunf6n3aov16i2r231ldovua2/burodowusowiren.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/72260673288.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/161052ccb5f34a---85735740216.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/xakimurezavilitug.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2a5135fe3---3709305089.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da16134462---31582457431.pdfIn PDF document text
    • http://iehyun.com/editorupload/file/pirajovomexexadaw.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210605122939.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/a7f52ea542c84a555bb3a31376ef9061/lejotogepewefafopigunux.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_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 11136 bytes
SHA-256: eca91f896104153091f94fc3922703d562f33c1e8e7ede3ffe7102e3da5e137a
font_01_sfnt_off00012bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D5 17496 bytes
SHA-256: 4166e49f060e8c30ef96dad9c5ccfda0a331c84ebf312e872c5b86a3d6de5e76

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