Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f37224df27ef9ce…

MALICIOUS

PDF

77.3 KB Created: 2021-06-26 12:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 49f73716bfd7a286ce7e3eab7c267c56 SHA-1: c01ab063cb3aa17e7f25b6417bcc26c8e6f0e79b SHA-256: 7f37224df27ef9cebede696a298d4bd2baf739aa4c8ab107e07c73edf967a2a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or domains associated with link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a deliberate attempt to obscure the final destination through multiple redirects and potentially malicious hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://x-software.cz/data/file/tuwejovizakifo.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb6bd7610---53031532953.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/d01ba3dbbd508a27ff588f57a75610e6/lojipilabaritutim.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/j9ggskepfhhbmjb2fts7ok3ds6/taditexedalunumuvi.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kd0eh54mi68eo9enmt7930sqq2/55765897105.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/xefuxekizowu.pdfIn PDF document text
    • https://wrd13.com/force/file/zudetemugulukudapadukasez.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/01agn2pqck9mn81t1ecnmt34q4/76103763164.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fffee0dd---92727251755.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/66bpivh57dhp5qstvfvvkcuki1/bipavutumovun.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcdbdaf64---sejejivukogisajesak.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/titadawakulimeretuta.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/61cc93e2f07719a974552980d07e8aeb/80097698267.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/fupenuku.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216812565525.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3c10c2d53ee460b999a611db60f2b43c/kiludowujevorabo.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607843486cb4d---zerimapewabokefejetepuve.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/aeqvt79n44fikquq5i4ad71pnd/97740035144.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/zojufogamefa.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb88006e35---43012647849.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/29867937169.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/22955830406.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706f2f0de08---jilozejomi.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/75807272814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=lines+that+form+right+angles+at+their+point+of+intersectionPDF 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_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 17088 bytes
SHA-256: 99e72273ebaca385b3971fb2221954cfa4a8da198a20ce650d85f18285104e70
font_01_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 10884 bytes
SHA-256: 25072fb3021d01caf4b04851d5fd672c6f4484d3ded119a02f25bbd7ff009245
font_02_sfnt_off00010f28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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