Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bfece007d9b71a…

MALICIOUS

PDF

104.1 KB Created: 2021-09-05 15:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e06c6e588e57c9dd2c11e6f0e52cae6c SHA-1: 624b20c3ab37a781bc8a451fa12f8349ea2ad816 SHA-256: 25bfece007d9b71ab9240c0a1a7efe8321f4a2de0a1ffc730e49d6f0a0442163
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and external URI firings point towards the use of external resources to host malicious content or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://inwebjor.ru/uplcv?utm_term=adobe+after+effects+cs6+shortcuts+pdf PDF link annotation
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/4leoiu2i4hmbnn4sires1s142v/ginitu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ef7d61e9cfdea1dc2c8d699774b092fd/funozexidamujiwofuzotupa.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/15204138422.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/87208824777.pdfIn PDF document text
    • http://kdekdyjak.cz/data/mimadiripipuseb.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/93637716525.pdfIn PDF document text
    • http://compsult.net/userfiles/file/purotudinumivobawozotezig.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/popisa.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/gizaj.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/86863504772.pdfIn PDF document text
    • https://adikkedua.com/contents//files/26474069474.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/0c663074d10c8aed5f4f62eb00491df7/tejavisibowujibebewop.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/7127960407.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/vawavitenigudipifilowu.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vavil.pdfIn PDF document text
    • http://jaatkinson.com/userimages/jofotu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/mudoma.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/37f7c063979796336d30088fbc5f1c72/tafapebekekin.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/c3a5491a13436876e31d76f780114ca5/426429430.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/winudenidalim.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0856e84fd39534e1efec0e0f13b7ee2/2506805706.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/3cfpp71kg3dnkbg1sng1du6iqf/kinijevavobekokibuxowe.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69840773e---29271912615.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/3678011825.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/lararitu.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_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10864 bytes
SHA-256: 4ed7ae70410f8d1f4beda17bc233fc0702d3179021bd8c01a0db8aa659c8f768
font_01_sfnt_off00014be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE8 17876 bytes
SHA-256: 30730135f57c623b7cbdb6474a2689e4e706bb2b7fb4297a2242eb40da591634
font_02_sfnt_off000179f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1