Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbbd375d41d6c1b1…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 19:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dd6f1e46f2f2813792fb48ea427a796e SHA-1: d3ad932729d2ff7f8287c5cba22e68e67dfcbc9b SHA-256: fbbd375d41d6c1b19425b5fa5abf03acd079ff3c7701cb3dec8bc8bab0f2bd3e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=how+to+build+android+app+unity PDF link annotation
    • http://eapver.com/upload/ckimg/files/202109121433002892.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f85741ce47---87018584722.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/wikobagoforemenukabatug.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/49484104659.pdfIn PDF document text
    • http://mgrima.com/files/file/juxogasato.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/56020715953.pdfIn PDF document text
    • http://dailygameresult.com/editor/UserFiles2/files/xososexadod.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/87674550289.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/92d49343b1dec22a3ec7ed5773a6c39e/22247750045.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-2/20210902124854195508.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/dotezefaxatopojopejereje.pdfIn PDF document text
    • http://1carl.com/userfiles/file/7318592167.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/89049419324.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/vorakewok.pdfIn PDF document text
    • https://moolans.com/uploads/files/linuxababeba.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-09-18-08-29-28.pdfIn PDF document text
    • https://jck.ro/userfiles/file/99026071362.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/faxur.pdfIn PDF document text
    • https://kultmotor.hu/images/files/bidifawevabilonizevo.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/45097800859.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8682ae9f---lufowiru.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/wibamokowirigibazat.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/giserokasifaji.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/kesabefetunok.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091101481063.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 18056 bytes
SHA-256: b63db1103aa5ec7211688ee53a37b98cb6a7cbd5c81d5f34fd06b6e385852205
font_02_sfnt_off00012e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6F 10516 bytes
SHA-256: d0cf0823434b18c7345bca63424a85852b730c9b329493aaf1d22bc00aab036e

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