Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a6dbada752cccb2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-14 02:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0ac6152d1afb827ec2014befa67cc3c6 SHA-1: aa58aaf7b88a025296c9ec6c2a85446138ddd8b1 SHA-256: 8a6dbada752cccb294f570039a69c1becbabd978e43b1f8e5049d62da3068297
224 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddc9a4813a---tudovolotamoxawap.pdf In PDF document text
    • https://suruburi.net/mm/file/vekufewulagus.pdfIn PDF document text
    • http://glassick.com/userfiles/file/14357447835.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/pawipevowasewiwinar.pdfIn PDF document text
    • https://limsurdua.com/contents/files/44179263174.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/52447409336.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/60677032202.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/tugofodiluvu.pdfIn PDF document text
    • https://yasacompany.com/upload/files/kabezofiwisepepe.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/87863990731.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wiwonadibaxomasegadu.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/bapokisowakenub.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vo0npies1nbjkstt7t5kqh9bre/fezuzelipune.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/6044827193.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/fubilexibitomizukukuje.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/dgia87n9b4hspogrjvke3n5ugc/salisajufozemo.pdfIn PDF document text
    • http://boki.hu/editor_up/95290527837.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/kavafikemadux.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/38894066396.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/31741065896.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/3499166880.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=unlock+android+phone+without+pinPDF 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_off0000c2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F7 17096 bytes
SHA-256: 7800537189a18c0a53d5319ce60ae54c4fa9a2ea0ffeabb3edd53f1513ada78f
font_01_sfnt_off0000ef27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10728 bytes
SHA-256: 657d2db04e0902380dbbca0a5a763d1ea16e7d31b48e9f14cd89d44778f9c5fe

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