Malicious PDF — malware analysis report

Static analysis result for SHA-256 e159be8378d02108…

MALICIOUS

PDF

75.4 KB Created: 2021-09-07 13:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e21e3264108a4fb6649fa3f1da6000b9 SHA-1: 5058f1087c1c2a255d14abb52e6071d05b19598a SHA-256: e159be8378d02108b55bc5ec6db73e4d9865d5faa173a5932a23da3da973af4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to compromised WordPress installations, likely intended to redirect users to malicious content or phishing sites. The presence of external URI heuristics and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://wastran.ru/uplcv?utm_term=haryana+gk+book+lucent+pdf PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33322c972d---30729591942.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e020763631---37068148128.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826378eeb7a---69282391861.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76173bf3c7---rakepedukerobalevowesosu.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/4ooherqqc1kc0n66fkp9bv0s76/90363205759.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/19105029326.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/0653404c8c88452f91969472a15322b6/81948739235.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/jiwabesidorokupom.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a5d77c1a2ed---72500972836.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/nowufavikodosolabopeteva.pdfIn PDF document text
    • https://questyme.com/userfiles/file/98741570325.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/ragugizubuzojevimuzopu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a044ca183---pubuxusuzarokosejox.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/97476781770.pdfIn PDF document text
    • https://renewone.de/files/14873053770.pdfIn PDF document text
    • http://zimmerei-possert.at/30935755357.pdfIn PDF document text
    • http://charivne.info/images/file/93995692973.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ua1nq7k7lpoa25gd6p9une2rj1/gezube.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2df70e28---70944616007.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a704bd0704a.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cbe1a1284---lobafetijavew.pdfIn PDF document text
    • http://htwy.com/upload/file/35559564862.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_off0000be3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 18768 bytes
SHA-256: ccf2d2f0dbad5d1dc115a51cf16a554e003c82b63c49f6f9842a833be5a28295
font_02_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 10972 bytes
SHA-256: e64e3451ff8d8079596db6fe95c6d17f285b72ceba80cf19b08bc544c60bf917

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