Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9a7a67ab24ba0f…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 03:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e776a0d38b99eb9a9a5ba57be18dc600 SHA-1: 1f358bfec18acd36e9ec70036757f3ee7c01e5bf SHA-256: 9a9a7a67ab24ba0fcffcedcc05de8eb7abca5bd64c22c1dd4bdc3e08655c22af
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ketchas.ru/uplcv?utm_term=mobile+legends+new+version+apk PDF link annotation
    • https://cardion.dk/gfx/fckimages/file/wutafebegu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/61290437370.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/lipawezisewunod.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/091113458373.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161341f1de19bb---27640849928.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/lasapud.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/rafifejilebirukilowiri.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210911_68E581DFC13BC436.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/29693100546.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/b7p6aqma0fqvbi4o6bi8ialsn5/nalipoburibitetivezabi.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/rimadozufitudenoku.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/mesaxu.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16134a1be3c5fb---522090153.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/marilafuwi.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa15c5d07a---28817582917.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/65881950058.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tivivamovadiminiz.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/12507660385.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/ditanowazezazatukebogif.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/38694092424.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/fiwaximof.pdfIn PDF document text
    • https://www.posluh.hr/ckfinder/userfiles/files/suvusajupelawomixun.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_off0000dadd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 10848 bytes
SHA-256: 069426343c3a9d893d1083b7af9682f6694d32e2136c89d362aa847312e4502e
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 17660 bytes
SHA-256: 777a924bcdd36ad3fd5604990e24873d4c3a4178f6caff5969ead2c02c0ee9d9