Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f919ae03be6c85d…

MALICIOUS

PDF

93.9 KB Created: 2021-09-02 17:10:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0f1406f78072629f5b3d524081345e37 SHA-1: a0e47b7e2ff0c6716b436e7da10fdba38eff9c2e SHA-256: 7f919ae03be6c85dfbc7a55702675e4431d6737bb9a25b6a0e4589954bb68050
156 Risk Score

Malware Insights

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

The PDF 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, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://taiwanglassgroup.cn/userfiles/file/88220442431.pdf In PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/798cf0f34eaf6d6e055c11db1632504b/kosixenowajepasizejefili.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/086e2cb74c35aadd418d848e8668e3e3/31006126857.pdfIn PDF document text
    • https://thepainter.asia/upload/files/pegipugebevanif.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb9e5dc42---46887072154.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/52333173560c11128e4164.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///74713467831.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9a4e808b5de720ba15689b9e104b8e92/fexalusakileziwuxaluwazax.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/kejoferadewafuvukatewuf.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3a586afd1f56554ee4ee53aedf726d97/xipaluzuk.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/63khai8vn2k7rmoorpuqkqsoft/wopapisazasej.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160946add1d830---buvupani.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99747711825.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/dudebefepatezip.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/46c82c88f22ae4b81ac1858823c35fcc/kogupazipinidaxa.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/xopirabaterajenuguzu.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fb5592a57---fabugixikinerivovedox.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/wisitimovefuwabot.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da62fed67cd---77949361869.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/41485856159.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/pagiw.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/91054166090.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/20447440681.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/c946543fa15634b8328364877fe7ef62/suluxexebabiselojaripe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mapping+earth%27s+interior+data+analysis+worksheet+answersPDF 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_off00010b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3A 17248 bytes
SHA-256: 6f2cd799a4bbcb7b0709f0d8e40221d8104659a6b93d9e4ee9a64370869b3f2e
font_01_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 10992 bytes
SHA-256: 28e99fed60c0447cbc2322d8f48ac7511ca969e644c7aaec0a0505f91ef5bd04
font_02_sfnt_off00015143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15143 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1