Malicious PDF — malware analysis report

Static analysis result for SHA-256 96813f96a745963e…

MALICIOUS

PDF

98.2 KB Created: 2021-07-14 04:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 540c80f3b41a6e2c6e58d0441ddd6321 SHA-1: cc1242b0435f6f953d9e0687651052f03553c80e SHA-256: 96813f96a745963efd3d08d45bb8c0e2c95543d91c6ed9fb3a6d8de2a93a39a0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The high ML score and ClamAV detection indicate a strong likelihood of malicious intent. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 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://oniceh.ru/uplcv?utm_term=open+water+swimming+lessons
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1e49fabe---22993503165.pdf
    • https://angkorphotographyguide.com/userfiles/file/pijimevevagam.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/86447002613.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b2552a9d---97608691449.pdf
    • http://it-hair.com/userfiles/waxobexowuse.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uukij7qgicstp8ff5bt56gdn43/daxiku.pdf
    • http://baigeleather.com/userfiles/file/83594759534.pdf
    • http://anatolianlgs.com/userfiles/file/74079577921.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/39c072d2c905ba12b893d37587013ddf/55963500686.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c94367b7c48---semigimubukekije.pdf
    • http://cesurmakina.com/userfiles/file/bijilikivogezofeviremirak.pdf
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/34620817017.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/fa13c448385ae4704b591853fc5c6c23/96400610556.pdf
    • http://fabtur.ru/upload/files/bakemanezowi.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7e895d61f1451307161e484e68adf0e3/63334746679.pdf
    • http://studiodispirito.it/userfiles/file/67826012315.pdf
    • http://stjconsulting.it/userfiles/files/bowomadekot.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a40979ae61---dusezabotupefiwewevin.pdf
    • http://plncse.hu/php_data/file/bonojinuxeba.pdf
    • http://flyingcarpetclementines.com/userfiles/files/zorawezakojusikawekem.pdf
    • https://thietbidiensino.vn/media/ftp/file/masilimifipumujomi.pdf
    • http://thekitchendesignstudio.org/uploads/files/7832768266.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e63.bin
fab56ad8c6f157f1a4ab84146d4193d4ae84bc24bc7f031f527a67516241ee76
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E63 10708 bytes
font_01_sfnt_off0001370e.bin
3ef9d9646d638f22bf0ee5ca19612faa4dfa8e191ec82ad6136fc66f6451d2a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1370E 17256 bytes
font_02_sfnt_off000163f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x163F8 16792 bytes