Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b1e76eb76721cc…

MALICIOUS

PDF

104.0 KB Created: 2021-09-01 11:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 05350cb1ebd16640fc735028c571db89 SHA-1: 2c08ff78a3b713b0ac94282cf38fad150dcc4769 SHA-256: 13b1e76eb76721cc9c109849523ac4a459db1c338badb2b6f031231a1ca3f674
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. These links are designed to lure users to malicious content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074883610722---37302443973.pdf In PDF document text
    • http://immobilieninvestors.com/userfiles/file/27596967064.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/xuwikovu.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/d9fa5abc23ff23e468b851e357f18229/fedasepimegawapugi.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/sofufiwafoko.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d404c1fe22---15502358878.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/2585493794.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/72644508135.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/duzexumanimobezewugumot.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b1a3a05e---suzamum.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/57121090187.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/93485306977.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/lusewaderilijetekozefe.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/30672777721.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/21474574222.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/tufuzojotidi.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/xisolumasi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c35105db54c---fanirotamiretaluzo.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/lixodi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c10f3313fdc---99977952084.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd793f1402---81339833302.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/eb7391a589a17f46c7cbf7b6b3966de3/50352598535.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lapobibogoximoburixapilon.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/af606e3669c0429cc981ca1d81b63f8c/fekuxosunipi.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wusuwezilabid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mind+on+your+business+quotesPDF link annotation
    • 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_off00013084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13084 18688 bytes
SHA-256: cbcd13b4e50765a67c4c92a51266024cd0e951939e2deaf78c44c0bf4c073a25
font_01_sfnt_off00016139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16139 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17950 10524 bytes
SHA-256: 170b3857513e81bcf552fddfba3b8c1353c5fb9bc00ac55b7650e6defccb4cdc

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