Malicious PDF — malware analysis report

Static analysis result for SHA-256 1154c6defe0719ec…

MALICIOUS

PDF

78.3 KB Created: 2021-09-14 10:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5cbfdc45da3027d3107d21d28e468bbf SHA-1: 4889283064bacfffe8bd2947ad0d9e5314229783 SHA-256: 1154c6defe0719ece52a440bb410430af5b70c84596c1ec4451ddc58ae4dfe40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cructi.ru/uplcv?utm_term=truck+simulator+pro+europe PDF link annotation
    • https://nacionalequipamentos.com/ckeditor/uploads/files/xerigazolanaresen.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/62752590240.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/49629221532.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/68266992977.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lesomagefumelotibefifo.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/34198507803.pdfIn PDF document text
    • https://wsbtitan.com/images/file/vojife.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/19585812356.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/ridatefo.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613821db447a9---35188910431.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///panubofe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d30b3a6d6---tatepuketetevimubini.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/59327041643.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/57394285306.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/tokuwiwalezejupomufa.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/feveginakavezo.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/80862886872.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3d56068c19f0fb06ade10680d7cbdb86/xavogumaxatusazez.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210902_12AC98F44615FB2D.pdfIn PDF document text
    • http://modern-pro.ru/files/file/xunezipe.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/39547322373.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fawatiwofofo.pdfIn PDF document text
    • https://geloracinta.com/contents/files/24153027446.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/gipijirevapegul.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_off0000c7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F5 19504 bytes
SHA-256: b1f11d1030eaadba7a5253d9543eefee68bcc944113bddc1b32c13b2a4c50ddb
font_01_sfnt_off0000fae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 10588 bytes
SHA-256: 34e8dc178db834001da8d07e7127ecbe6d820f164ffdb2888998e7349ce6f382

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