Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa7ce42df7ea4e…

MALICIOUS

PDF

100.7 KB Created: 2021-06-24 07:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3bf3f28eab7e6b0f8ef145bc6b3aefe0 SHA-1: 9b684165d5d02febb26e082833573c81b83de315 SHA-256: 83fa7ce42df7ea4e758a0db82a925dd0fa7450c5fbf4b967b25983da738cd4f2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://catamma.ru/uplcv?utm_term=miraculous+ladybug+and+cat+noir+season+3+episode+1 PDF link annotation
    • http://ideas4mypool.com/userfiles/file/podotoguvidubifog.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/1122162e91860597a60194bdaba33aaa/21113110147.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/26849302171.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3kvlanrigepb0h0k7lfcn4qba6/40851923399.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/kn79rr2s7bngbs9kctp9iqn7j1/45972854524.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/siwexojodanuvawidovis.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad09caa62e---wimaxiwekepojuni.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b77d1c79c73---kikuf.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada24781c9---50384239012.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f3bcc753---titozewekedivirudesejexe.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83f07f554---34064011143.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb2847e580---xeniruvosikodibi.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/06vft8e6fjj30t89g9pmg4u1i3/jogubolusixa.pdfIn PDF document text
    • http://funperm.ru/content/file/90571346735.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/o9c1pubhhvarj9p0d3hcv3jvb0/punerujuz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da6ea8950---tukez.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/togilikikosabozilek.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b167aac5ab6---geduselusek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B64 2960 bytes
SHA-256: 4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac
font_01_sfnt_off000145d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145D4 5704 bytes
SHA-256: c1b4279d1a75e83448c04780fdb6bccb1df812209ce5d36128d3ee91a5534437
font_02_sfnt_off0001595e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595E 12864 bytes
SHA-256: 8bc332a54aa6f0a65b632064562832cdc3fddb39e15a90bab2647e9cb75d133e

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