Malicious PDF — malware analysis report

Static analysis result for SHA-256 869326d9e938bf97…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 01:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 422af29d1a78605aee5a9c95fbcc19ed SHA-1: d9a3cc7520ade938852cbcfb78b08744b9f92302 SHA-256: 869326d9e938bf97e6a5dd8c39ed933f56b01c1eb999267a13b338f568af0e63
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. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final malicious destination. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest it's used as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://nickels.design/ckfinder/userfiles/files/xaverugif.pdf In PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/83bf672a9f3e76a19c5fbd43d4d8def8/nafepanalafofuwitel.pdfIn PDF document text
    • http://handgun.ee/media/file/56420126199.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c616618a8---lorakosuxadegi.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ot69litbbm3ht7b9s56hv5dth4/nenewepudupepanukopimaxer.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780f6c61256---desetanaf.pdfIn PDF document text
    • http://fruitvita.com/files/files/92845348334.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nepisikukagolotosolarukar.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/65175982427.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/96b24d8987ad5eb7815f49cd8828754e/36222025937.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/41e83fc79563b379ac8e28dbe2aca1bc/39001100484.pdfIn PDF document text
    • https://sbufficio.it/file/62635268635.pdfIn PDF document text
    • http://saddabro.com/userfiles/file/54361075044.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/70331334615.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/gusamavijukum.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/449988806.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/lamesavikewuzisobopo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/14717630939.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3b5fb504e---lafibej.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210708_D97E58BF37A115A2.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/gqi1oa2i77jvrrb6glqgbbh1op/ledazetuze.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/v7mqjs1qg6ajkl5v4q2f3b24j6/kizopojaroputu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/7h5rso9hndrpbnhbcfh8hbq2k1/80293541329.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=microbiology+laboratory+theory+and+application+brief+3rd+edition+pdfPDF 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_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 11152 bytes
SHA-256: 6d7d636c4525186140a5fb6e383288a861e2a5550b35276700f78422db174436
font_02_sfnt_off00010183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10183 17800 bytes
SHA-256: a1176aa2cca8834f2664355e6ef3bceda7ab6cf22a7dee8fbec01e308a105f41

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