Malicious PDF — malware analysis report

Static analysis result for SHA-256 3882a15eb5f27940…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 02:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2de46ffbf75e5ade993974a3c5b2526 SHA-1: 3a970907894c6a541857f904120cb2be1de02afb SHA-256: 3882a15eb5f27940bd8d0b747084f8bc79e9011e3bd7cabdff3883b581ea9f26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://oniceh.ru/uplcv?utm_term=soundtrack+fifth+element+song+list PDF link annotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d5b9ad89---remezolefebewagotaxene.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/wawosorodobuwumaduwake.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080dfd6e2d5c---fokiwetiwinamixorugujeju.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/72907620011.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/279c5162a74c49f2dc8c604ed1710b1e/wipolitawixoximulega.pdfIn PDF document text
    • http://texmet.pl/userimages/file/65673793280.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a696224383---badilol.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606da032a22bb---mipiki.pdfIn PDF document text
    • https://sambelteri.com/contents//files/21335213236.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608683fa08a66---jupokowigenitotoz.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c0361dd12a7---pasetilubeta.pdfIn PDF document text
    • https://33mobility.net/uploads/files/misakasewexomavatibubi.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/64812730904.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eed3b397---64505952750.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd4bb8832e---retotipe.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qi74e7l1uur8n2qr897l432rn6/tesusaz.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/latekixarowebusoli.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/7361497198.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/mujugozufavir.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/66278105327.pdfIn PDF document text
    • http://casaalu.com/luutru/files/lesirabujudinovipafaseg.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/rs2kk1sdsi0gsh7b6e3rcaaa9a/jepobaketonikas.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/64782157665.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/c06b612ad4cf6a5a8e98ba5a563ef119/8424822361.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_off0000d412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC29 11192 bytes
SHA-256: fe90ba075ecc6ca9a9709adc828fa9afb9d825d7bf59bca5990ef1ee6633cab8
font_02_sfnt_off000105f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F2 17592 bytes
SHA-256: 804833d680f80d7b2e5dc53a7b253a11de043fe849dc3a1fcd82cd3bd11925d8

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