Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f4fcbd18468fa7…

MALICIOUS

PDF

68.7 KB Created: 2021-09-27 05:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a3b790bd29ba64b9aa030323ac1b0655 SHA-1: 79187cabf338e7e891993509cdfd14eb21b8360e SHA-256: 82f4fcbd18468fa77b88673c2fcfb31649ef9aa8f51f76f8e473fee7490bf8a7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document body is heavily obfuscated, but heuristics indicate it contains multiple links pointing to potentially compromised websites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=watch+caught+up+movie+online+free PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/mpgiv7ro9s9ch4lr05mn4ld7k4/negeseguzugaxekufe.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/jekemapejexazevufij.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/porariribanikenipawew.pdfIn PDF document text
    • http://standdominica.org/files/files/56575863402.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/17135640402.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/mimofepesitatuvopetuzejed.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/parazerule.pdfIn PDF document text
    • https://alkoplast.rs/files/xanebipidapegaxazewivexe.pdfIn PDF document text
    • http://kechengchem.com/upload/files/76227157706.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/84106066568.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137631082bc8---tuzigepilulef.pdfIn PDF document text
    • http://melvin.cz/data/6146045688.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/76264618793.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/tokedewuvi.pdfIn PDF document text
    • http://www.sandipmallick.com/fckimages/file/72119476398.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16150e80ba7e89---60775636296.pdfIn PDF document text
    • http://coffee33.ru/archive/file/vojibodefifewan.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/negideboxunuk.pdfIn PDF document text
    • http://yigang-lin.com/uploads/files/202109230759033491.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/70380734384.pdfIn PDF document text
    • https://value.ae/userfiles/file/kanenadasapeladapadufuro.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/41805256273.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/19348104750.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_off0000ae87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69E 10916 bytes
SHA-256: 211f0db1d190c2be81ab3cf8c4b1cfe1c5317b1f6ff4ade57ae377b0231055a5
font_02_sfnt_off0000dfc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC4 14496 bytes
SHA-256: c99022dfdbf51c77b5d529413ba70ee7e73e1e1aec2be59e459093018e83c2f1

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