Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4892d99d623b39…

MALICIOUS

PDF

82.6 KB Created: 2021-08-26 08:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d1980de24a6071fcae0b1780481e987 SHA-1: 306488298be537b5d39790a1f0d77396b6cdd246 SHA-256: 3b4892d99d623b392cb33685de59a2b5630cd69c8a22f4dfd39d12e96ea48104
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crysiq.ru/uplcv?utm_term=punctuation+after+quotes+with+question+mark PDF link annotation
    • http://tuhs1970.com/clients/a/ac/acc339db084e87cdfae31a76a6c96f1c/File/mikir.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/323888c92394ece2f77a0f7fa089ddd4/tirewobufepitux.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/53544143901.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/s7m73coofdum63tqodr33l0rdp/76933586174.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3abc8879b---soludexetitilu.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/dusixos.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/rkjcak3h97s0pqc4lj3v03baus/48971645428.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/77756912046.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/munatumel.pdfIn PDF document text
    • http://e-district.org/userfiles/file/sibasesejixezokikutaponix.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/sirunafodobumegokefif.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/73567110201.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/24ec8dc5ec5f582e350547232d035481/26426900889.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/96196210819.pdfIn PDF document text
    • http://hueide.com/upload/files/47437679274.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31fedf5ce---55410601541.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee53078c961---80653317984.pdfIn PDF document text
    • https://777mto.com/contents//files/tesofimededebinopigabipij.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/norinisafij.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/mawizimuvipoxuzo.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/d6882956761009e24de253b898b05eea/boguzunupozawuz.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/rejubalidadunozow.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_off0000dd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5F 10980 bytes
SHA-256: 544f88b06aff0ec4aaa180b4d9c48c3ed1b9ebebb264a07f6039aed83e6456ae
font_01_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 17172 bytes
SHA-256: 4dce3b0b43ad152f31a91342d7c0a5906f5f1a9fca3141ba36fff94d12458bd0
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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