Malicious PDF — malware analysis report

Static analysis result for SHA-256 20610a11640a80ec…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 05:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 336914be7c3e7de8512a5141e07593ac SHA-1: 32f955669139e50d40e83ebf7b7275aa9e99c6cb SHA-256: 20610a11640a80ec2f5aa3ee6a8c4f4d9b4c943ef9fbfcc9b021a1fb3e88d054
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to conceal its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudoxokeweromakikosek.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/3d11ec5a9f13779666125b24725f2468/16163732150.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e750c01f2b---85766540535.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/ragodo.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/90976995440.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210613070810_3aeby5.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093c64d6a332---98818600615.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qhqoplet1coovgbbcje7ce845s/zakegazagorunujejus.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/bopinalilakemelenuge.pdfIn PDF document text
    • https://chp-travel.ir/data/file/24501336886.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zazititibonuripa.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/lumobufezuzejol.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/b66477e50e6cc88aace2dfed2f702ea4/39589104076.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/53883657527.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/7c804965379c98fee659dc4ee78c35a4/gufef.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/64fr4bfdqb9jov4cud851jo5h1/31586413326.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/letebudunojamo.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/13455647141.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c218c3749ba---55367651764.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a8a88b596---makatibotanasilofiwifiji.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/8551596044.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+linux+kernel+module+programming+guide+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 18540 bytes
SHA-256: 26bf75dea8f4d694df90dde84f7a3de8cf8c6969f38a25d761858de1c26d8c22
font_01_sfnt_off00010a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A81 2064 bytes
SHA-256: 46b41152c66239606199adeeb56fa6f0c95586cce1373289504480bb8e1ff93d
font_02_sfnt_off000113e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 10936 bytes
SHA-256: 6ef4188296fa8b7833fa6088bf47a02d02599dd3856ec58ebfcfa4dbf77c13c4

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