Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8363b1a234ede29…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 12:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6682cd05d7d131274578942a71fc6ff3 SHA-1: cde03b0cebed9be77ba48020c25c7cb1dc5c1c7b SHA-256: b8363b1a234ede2989a7fa5144109dc7c716c1dec6e8f07c95a2425747207fcf
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to execute the embedded JavaScript, which in turn redirects users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=stickers+creator+apk PDF link annotation
    • https://indiantiffin4me.com/nbloom/fckuploads/file/welesufiw.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210909021532.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/zadetivazisakukivisavu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144539b298b2---regeromaluvugedum.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/70012152122.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/33262901259.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/54232023642.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/40388105302.pdfIn PDF document text
    • https://ripedzn.com/app/webroot/files/fckeditor/file/64150780001.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/13767375039.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/zilimopividojapujolil.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161457934c99b4---somavejagebowub.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/17068631603.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/pivesukirizusojenakufuxa.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ad150a36a271a36b6158498449287f2a/46976075217.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/11152015676.pdfIn PDF document text
    • http://bluebossa.pl/files/file/fakatarokiledaz.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/xezuvopukuwujowe.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/4ed379818d2f98b01a0ebed335748843/14504963233.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/nedudirisejaxisiki.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xuzaneramut.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143c26820259---36307974207.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/67404088874.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210903_843CCCF96AE67BF9.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_off0000dbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 18140 bytes
SHA-256: a162816ff5dd0a0fb7075cd5799037bc4efc52c896eda7cb2aa5ebd9f793d8fe
font_02_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 10384 bytes
SHA-256: ee12c5459ef72027771128179051347cffaff44db1087b9be42f8b3a7cdeffb6