Malicious PDF — malware analysis report

Static analysis result for SHA-256 db52d46cb7b58471…

MALICIOUS

PDF

91.8 KB Created: 2021-08-25 23:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 50bf3d230c63cc3a847b1d6fad53c452 SHA-1: 7a7ed8e090ddab54fe4f20372855cdf1d11e0e26 SHA-256: db52d46cb7b58471eb2ed3b709ee877038c1abed0dbea436c6fa5195dcb31594
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest an attempt to redirect users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://drafthe.ru/uplcv?utm_term=cross+country+skiing+in+north+conway+nh PDF link annotation
    • http://teifsepahan.com/files/file/migukexineve.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1608755c12f6b8---xenasun.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/pagikobatodizotames.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/9640654969.pdfIn PDF document text
    • https://tangentemag.com/img/file/kuwebosowefuzor.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160746553a0d97---zoxejurifevijax.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/bd813cedd8b27bd5367a9b4cc3d514bf/nexuned.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4193237c2---xepugujijobipixuvebifewi.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1dvbbi1spdaf6ofkf29sjgjb72/weduliwavavumigeriwa.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/nikaveperaj.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9ea129a6e68acd804e8a0ec25bafa7ac/82317000760.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/5387840556.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088321440d3d---52900694554.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/zivajijigoka.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/7935032716.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/48507022619.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/winul.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/17523373428.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/78653075236.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/jatikogis.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/jetijubagumagodiwezu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/kcbobd1evsqesdqmqspl4f7gi0/mubemoratotawefej.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075ef6d9ec0c---bivabubetidusujumorokibo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-12/20210712211704637252.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc94970e56f---didamekomusegelapuneb.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_off0001015a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001196c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196C 17688 bytes
SHA-256: 7dac850a714d107b5451dd9007e388b6556bd4f2ec4f4ebb758beb647e604792
font_02_sfnt_off0001475a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 10752 bytes
SHA-256: 79f5530aa07880c2ca671bb86287c396f7dfa994d082f5fd9004094e4aa007a1

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