Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d738c2925e7cbc…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 21:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f580cee2630fa56c80e31344cfc290ca SHA-1: 0323c978883514ffd07f0d424136203e624f69aa SHA-256: 64d738c2925e7cbcf2235476bfa4b235cd6abbab8acc59e1285efb507791e6c0
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing lures or malware. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support its role as a traffic redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mg001.cn/upload_fck/file/2021-5-16/20210516012514282618.pdf In PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/82f1f791a483a6d528583cf2ec680525/sosovo.pdfIn PDF document text
    • http://suaups.net/userfiles/file/58342905838.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d87b9175---80187313889.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/fe7pt5tsmdrc3golo8m309huat/nulerisinif.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/41a40297c96ca2dc999ef71a3e5ad7c0/zolew.pdfIn PDF document text
    • https://avela.md/userfiles/file/18244750346.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/a80r8011lch2r6qrs1kontg8qh/87360253533.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcd27784308---10997500784.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/navelatupem.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/52931069100.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2e3ee7751---vasevovivoxa.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/muzukikizevip.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/cb9e63876452db1c0784673be7bacc30/59153447771.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/xorokareroviweku.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf71ba8542---7670871831.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/52133419935.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210822741_165541388.pdfIn PDF document text
    • http://russia-ex.com/73031201301.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/gojexukavukewexuguwamow.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/590a883903afc76a30db0f80aa3061d9/retojilesanitom.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/42d8176af3b9c79430f1577f43132166/50524915904.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2b5a0a6u43qrcu988s89l9pind/11699987943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=precalculus+textbook+pdf+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_off0000b8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A5 11044 bytes
SHA-256: ac8565d718fbc030f7f9fe73bee882bf3aa82c484280d15c3aa8701eb95b2fbf
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 15716 bytes
SHA-256: e3e32ab64a7304d6843c71133932f822fd9fafac4a20ffe7364351695bd9e2bd

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