Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e22d652bfeeaef…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 16:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1633a3cffcefdc1ed37417302770d887 SHA-1: 989e5f7c79a84aaba23ab80a81ddf94d786aad9a SHA-256: 82e22d652bfeeaef7b91b468a66494b9b418b9f310c93693526d4c54e06d2efb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://infrive.ru/uplcv?utm_term=multiplayer+games+with+friends+offline PDF link annotation
    • http://sure2trips.com/bot/ckfinder/uf/files/89614777484.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/pugujuzureterunivam.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/47373317076.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613568ff42e92---lomujuzilegarijemamox.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/18407574844.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/pijazibuzefibej.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161368644e535d---34280817026.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/94807405056.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/45575067406.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/dja7ho3f5s6eqph8nkjpu8eu3p/noperixerazuvuxumeju.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/loposib.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/mevomabosogiv.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/41368226009.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0387eca9ac538ed02568ce3beba59a27/tonetovebez.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/subokomosojanafiduvav.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/8095780681.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/kanuwetinujosadupakegatog.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/jubuxovaza.pdfIn PDF document text
    • http://amkchem.com/upload/files/3062423354.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/92062445348.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xijisisepafegegupak.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/32715174009.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/pakugamew.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_off0000ccd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD3 11236 bytes
SHA-256: 88300130b5e1ba7170cb8fb424cd99137fa77a8c0a50835e90d30429a0ff4358
font_01_sfnt_off0000e6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 17148 bytes
SHA-256: b5ed5c4f02d0a31e748c6b6546b3a2b7c2befb59bf4377e04d4f9da307a0c4d0

Open this report in the interactive analyzer, or submit your own file for analysis.