Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d34c7151f504d8…

MALICIOUS

PDF

82.5 KB Created: 2021-09-22 20:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8901a8413d7db23db8dc43fb27f9efde SHA-1: 6d164e7f636e645c0828bc4fa731f50272ab7cc4 SHA-256: 37d34c7151f504d8967ccf7ac8b5c0bed30af219e1436d8f8878fe1eb907dd89
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Bypass

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The embedded JavaScript and numerous external links, some pointing to compromised CMS uploads, suggest it's designed to lure users to phishing sites or download further payloads. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, a common tactic in malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=unlock+locked+phone+android PDF link annotation
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/betuto.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/zazaniralatenaruzeta.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/dorine.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/vobijadotekubijenakenas.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/p75t0mjl5n87s7uddtvi25irv3/luveruzekiwogesemexekezij.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/29407230160.pdfIn PDF document text
    • https://pindimana.in/uploads/file/gifodesad.pdfIn PDF document text
    • https://webaprint.be/img/file/52791106412.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/femosazeb.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132531d50439---45171055796.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e53e32a---dokalate.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/nekikagotorisudaxitomere.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/lumisaf.pdfIn PDF document text
    • http://atoutslegion.com/userfiles/file/97560350565.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/xakenekiwufemexegusixek.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161492204d1a11---87221456428.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/dazazebimunaba.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///nujomufikunelamufovazis.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/80489053398.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/lijowawijorigonuxusok.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/bovepavagojosax.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/19177155348.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c067860674846dabb2f0a43f4ed9670d/23078051914.pdfIn PDF document text
    • http://spbi.cz/res/file/48675687967.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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 10444 bytes
SHA-256: e6fa005b83692318751c8d31bbfee45d7e92a2a341a59daea0ea901f74b3143a
font_01_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 17684 bytes
SHA-256: 73be3918ddbaf4b03055e5880c7012537202082c45129d41b8db28214c7972a5
font_02_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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