Malicious PDF — malware analysis report

Static analysis result for SHA-256 498b746f2c57257f…

MALICIOUS

PDF

89.9 KB Created: 2021-08-12 12:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eea64caa5a57febdc661807c33a788b2 SHA-1: 5b6a55a0102ab0c57d88325e01be2161b9db1d73 SHA-256: 498b746f2c57257f2942fa52647d3a3213b146d60a0cfa2bcb5362ca34631eed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating attempts to leverage search engine optimization and compromised infrastructure for distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=problemas+de+multiplicaci%C3%B3n+de+fracciones+con+respuesta PDF link annotation
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5fd37634f---kulikelakederazaroxa.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/5223jll5nrep1c2sirpiiser3l/loxujimugirevadopipu.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kalokejexaviputowetefe.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/10188433392.pdfIn PDF document text
    • http://berbun.com/user_img/file/42240641656.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/146e303cb33fac6fd931bf4ab6006e1f/24545448747.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/parito.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aa98f4073e6---93821291159.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/romuwikimosezomatabive.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/62201199408.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/toropozatizuretav.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9ac85da3fb---89228982426.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/41609755444.pdfIn PDF document text
    • https://buka.ru/sadm_files/67345119262.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/bugimuwafoxexiloline.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/21676936967.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210708142138.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868a0a74fb---gokagojipugopa.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/liparoruno.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609efd65cb22c---bitinu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/c4e63c05bd56954a69528f9babfcf8f9/20962665357.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f48d9cd3fa5c8f1e951265c79ec4c6b4/48963516523.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0a4fc90e306b275145aa905ccd4a8fe5/60711386025.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/61534162960.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202108038251_38443221.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_off0000f5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A2 18068 bytes
SHA-256: 3c06de7d127ee30d25ee6b8d1f807de9638d1e9e78a26dfebebfc29746706c08
font_01_sfnt_off0001241a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241A 11160 bytes
SHA-256: 31f73386c742dc5a276585685fc270eb73de4fcd43948e0de5f94f2467a6bbd9
font_02_sfnt_off00013db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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