Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bb3ef5e605deeb…

MALICIOUS

PDF

75.5 KB Created: 2021-09-02 01:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a6a2b77a84d60616e67ae605e75b64da SHA-1: 1c698fd62e9a8828894659dda3a03b31ad7cc686 SHA-256: e8bb3ef5e605deeb0563cc1217a0aef73c4d4587e8aececbe142fb01102dec7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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 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 http://vrajacreation.com/uploaded_files/userfiles/files/vokesawovunakorupe.pdf In PDF document text
    • http://farmaciacogliate.it/userfiles/files/xukevigekunut.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/ruziresurasepeva.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d404715c4d---80801302114.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/lmd0qp6ujl0q3unk6nb5tq6mqo/jesajunomusuku.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/30001873362.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/65148612846.pdfIn PDF document text
    • https://areicon.com/images/file/58912852092.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/lexowusa.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608e382a8e4f5---suvabiwukenagobamapufu.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/49662860314.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7aec86aee---86773699729.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5fdfb27ae134869b8358e02959f7b1f/dukodawuk.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents//files/88371279878.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/53350790935.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/60593186532.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e29205e1f---79640602555.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1627192865.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/54400730861.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7a55de917---29238217621.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819c26ac997---sedurosidotitoxifotezu.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210629152653036.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/sibidujusiponeponulewa.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/vonisis.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/dudiwudemikixumukoraweju.pdfIn PDF document text
    • http://francancanseculas.com/wp-content/uploads/2017/05/04-canticola.mp3In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=canticle+of+the+creatures+st+francis+assisiPDF link annotation
    • 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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 16164 bytes
SHA-256: 03b2ae9e29219cf48e4a5a31ed91bc484e7d9a147eb8367d5d047b00e1de04a5
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 10564 bytes
SHA-256: bec60f4dd165b571ec7cfc23630483805f1b68c46c371a0d8b6586505e31ebae
font_02_sfnt_off00010746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1