Malicious PDF — malware analysis report

Static analysis result for SHA-256 664c01ae286e2c13…

MALICIOUS

PDF

82.7 KB Created: 2021-09-03 00:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da24d22fcad2260744992a353fa2e575 SHA-1: fd9ff48eb8509f61c1a41c9499a78d7f5cf6037b SHA-256: 664c01ae286e2c131268424e7580e444b3fc257476ac6b2da223ae8baf7fa018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of 'utm_term' parameters in some URLs suggests a phishing or tracking campaign. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=flu+shot+cdc+pdf PDF link annotation
    • http://bike-aholic.com/UserFiles/file/wixisufe.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/weperodokitebadugegagef.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/bubagek.pdfIn PDF document text
    • http://shophouse.info/images/files/20191323224.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/koluludagip.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/1b01d00c30d1a16d70aa55dcc7c1006a/vidibalaxoxazilufid.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/mfqh09mo8geo1kfol7c3419rss/pazavapifivaxepifapib.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/47166446269.pdfIn PDF document text
    • http://renknh.com/ckupload/files/30734196685.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/odn58jnvjan5383d8vs1n15l8s/fubatesatizadokirojek.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/54605751745.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210802_023643.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd2eb13e04---bukuxuzerelina.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/83616311549.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/59603663040.pdfIn PDF document text
    • https://mfdesign.hu/files/file/67648770473.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/10336657367.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ef2706306ed464caa1aa6ddc3c3d9d50/mexemijenajud.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6eba3e44c2c274da923319817fc2146f/tekeri.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/b2k6m8kdbiv1i23nsc9li96g3l/99095504036.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64f74fedd---zekenabarupudavone.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021082613063853.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28121606584.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 17908 bytes
SHA-256: 70303573126ef6f38c8186a677469c23abccf5aecf23c347bdd4ecdaa2094900
font_01_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 10204 bytes
SHA-256: 234f74f630851322b5b71b604197e9c1260f4408fc985c727a9212bd19b44c09
font_02_sfnt_off00012499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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