Malicious PDF — malware analysis report

Static analysis result for SHA-256 89eb221117842395…

MALICIOUS

PDF

164.0 KB Created: 2021-06-27 23:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11fa2885c7061f1d26c98bd96433f1c2 SHA-1: 71edddadcc431ec8ccc5c0d7f9693d64e14184e6 SHA-256: 89eb22111784239510b47788f7db2d6ceff1d7be56af2c4d4df32302594559b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://philabc.ru/uplcv?utm_term=cardioinhibitory+syncope+with+asystole
    • http://mega-gold.com/userfiles/files/43491927028.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/aee71abb79c5457c9e120b22cfbf5ae7/78946806920.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/fizixilupim.pdf
    • https://zlatartopalovic.rs//files/jabot.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/2b1b27c002c6ef7ebd39a0b887a76de4/83356345554.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160834f98a970f---19953281953.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b50facdca6e---latudapope.pdf
    • https://soalmatematik.com/userfiles/file/fulemopejowuwutelapufu.pdf
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/77d4f270f5dee087dc3212ba9093ce05/resowovowetokodekojadax.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caead6c66e---40048428411.pdf
    • https://ptogel2.com/contents//files/11281001263.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1767d3456c9518e28d6e1f702b180e37/48480572694.pdf
    • http://gat-asset.com/CKEdit/upload/files/83531137770.pdf
    • https://acrgroup.nl/userfiles/file/vabogulogopiwetibe.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/508731e8cf08d5f881908080a1ac425f/wepevuke.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/83c7f9507ac6f17228d7d9f75dd146c8/68339385352.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e453bca976---63697216737.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/s9jmn1tfpedgcd3oadp7bjjjj1/gamozumuvatitaka.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/37f21e11b968103e349ff0d6dc8aeba3/3365961629.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/424ade3b591a34459fd1e0749d65f263/97967950761.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8d334a6df3e5e4c951f5c81f074a4a1f/rozeludafarobired.pdf
    • https://proxus.nl/file/kozugamizatakomipi.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f28246e173---lokibozudowojononatewu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021bb3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x21BB3 16792 bytes
font_01_sfnt_off000233c5.bin
efa6dbea97f66eb783c175b2ccfeb1cbdea423707302d535d67270b4af0e9aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x233C5 19712 bytes
font_02_sfnt_off0002690a.bin
d2261b2db4dfc44f3a699c7c491f4d70ffd82b7fc7d6a8b477ce73f835338e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x2690A 10980 bytes