Malicious PDF — malware analysis report

Static analysis result for SHA-256 25149e7162202d1c…

MALICIOUS

PDF

81.5 KB Created: 2021-08-18 07:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 055194fb5277678ff59040d9470b9b1d SHA-1: 13e8e39900c069d2f127cb39032cf922eefd922c SHA-256: 25149e7162202d1cf135612ab707572903facb8d3ad0b107b53246b0d109b057
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of a 'download button' lure further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=9th+standard+social+science+book+in+english+medium+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vak6l2piutoatobfnemvb5cc97/nunezatoto.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/gojubukadufedopirejugi.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/37895514994.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/lunirupodopasovuzop.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/84749736459.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f11e3585317391960fcf1bbd167d696f/butonibewodixabuxig.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/4lggfdjdia94m18cjk6bjhg6d2/saditufebikomoralo.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e099a7d2b6---27326586546.pdfIn PDF document text
    • https://digicpictures.com/downloads/mubukuvasefakujum.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aea8be78e---19292251336.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070ecd9c3685---wakeg.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/57159344654.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/ac59ec405bbce40b6c6c06e17fbac0c9/rajuv.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/zatazigumadovixez.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210720_094602.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/74b81398e3adca5945cf8d59f0ece70d/44912427694.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be763ac1b0---jogonosesuxipo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/42346232898.pdfIn PDF document text
    • http://ychnjl.net/userfiles/files/39276408348.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/rusipadafunivegas.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/ac94bb324ce72a51088a4a2a266295d5/vagizi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/44sgbccdqrac4kgj4nsc9ok3mt/xikofujarikedirik.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c93b328be02ce7de86982a0ba447c6ba/vutevikefegapexozuzizato.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF112 11472 bytes
SHA-256: f94b82a4b804893e98ba7738b7ee2f5f2e21572f2524ca1391975b2c610c92c7
font_02_sfnt_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 16736 bytes
SHA-256: 75abb5399f61172c89a50a5f6998b42cc7f10d54489e8ea63459a8308be504bd

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