Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1da3a3b92cd829…

MALICIOUS

PDF

88.5 KB Created: 2021-07-07 20:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6053d7eafc94d5ff1636218f16657425 SHA-1: ef3ecc86f9945833df64caf27e4d2add5014b91b SHA-256: ae1da3a3b92cd829b2961a794c9293a93f89931183d2203b9c7f6ff6933b9d39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also hosts a link farm pointing to compromised websites, likely to trick users into downloading malware by impersonating legitimate software. The presence of embedded JavaScript and external links to potentially malicious domains strongly suggests an intent to execute further malicious code or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=minecraft+pocket+edition+free+download+mobile
    • http://9meclinic.com/ckfinder/userfiles/files/wuwirimovigoxaribupujuzi.pdf
    • http://aktifbant.com/resimler/files/vibosomotak.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f47de22e88---81435750446.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/64842a01460af163ef74301a0ccb7b92/toget.pdf
    • http://abpaluso.com/upload/file/felesubanateferamem.pdf
    • http://ks4073.com/file_media/file_image/file/logose.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/funedemupijepokamamezijem.pdf
    • http://g-shocktou.com/user_file/file/25438246039.pdf
    • https://rendiamovisibiliglinvisibili.org/file/dafup.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813c1627c38---tuxutowosim.pdf
    • http://przedszkolenisko.pl/userfiles/file/pujozowulazew.pdf
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/jimegiviwuwiravamut.pdf
    • https://ever-progress.com/upload/files/jifudipalalado.pdf
    • http://grimastone.ru/files/nemikajijumevifakutunipa.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/6bd05a61c23030f1538019025a658053/nawimofirigisidixeniguj.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/wakibejexenoripoguk.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/42d82bca8801c52b1f38065f5fa2ae3d/15259088231.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/7777j0bgon8i19ogo2bqttensp/fumixigemalogovewo.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/2lj667st2cvfsauf5532na7lb0/47361494010.pdf
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b7766992---vemuze.pdf
    • http://tsutae-f.com/js/upload/files/busex.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607becd380cde---zesuwupabexowajezupaz.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090a4f2ba1c3---60857867148.pdf
    • http://el-system.jp/uploads/2012/files/defepipesuwenivu.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_off0000f6a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A6 16792 bytes
font_01_sfnt_off00010ebd.bin
f3ad4423717db4888009d92845433cde26d94dcef4132ca5f28470c8cf739e7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 10924 bytes
font_02_sfnt_off000127d7.bin
07898552b736e5d282a755b9ca8abbd29bcb0b933d52b7c550dfe6411bdc7869
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 16520 bytes