Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2a5ce5847b5454…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 17:26:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 276af41907693dce7cc4b2ac25e6346d SHA-1: 39d052f12a4e2c35a41c6909ffb8694274a2d036 SHA-256: 9d2a5ce5847b5454a3e928fbd97ebfe5bb0f2dc04fa5d53e98e9670dedd10042
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of distributing malicious links. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file. The document likely serves as a lure to direct users to phishing sites or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 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://allytemp.ru/uplcv?utm_term=villancicos+espa%C3%B1oles+piano+pdf PDF link annotation
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/k1jdcq9ejll71lvfj6ofov12h2/fewopurisufinus.pdfIn PDF document text
    • https://topupdana.com/contents//files/34215778994.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a7104a809c62c2ded55a69c9ab5cea38/29061248056.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/60677018595.pdfIn PDF document text
    • http://rnralpha.cz/res/file/lofibedibigota.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610921e2f279b---33708908236.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d901ae85082---42629154402.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100afba691a8---roguroku.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/xetaruzomaxar.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1630429575.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c428adf4cecfd0f8480a60d3d6056e9/gajevabedokufumezip.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/49441286247.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/natunawekutafutiva.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/kulinujuwuvixogi.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/fugakukofukatew.pdfIn PDF document text
    • http://ipllaser.in/uploads/fonepif.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077772981b8d---lugirepagasubitikuzim.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/35325478584.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/11747416241.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/46768455138.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/vedabexuvedidiv.pdfIn PDF document text
    • http://toyotarent.kr/FileData/ckfinder/files/20210630_AE2D137EE46EC178.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/48098395305.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/14511777329.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_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 10588 bytes
SHA-256: a01557701db263a382ac1cf02d9b16ee51478d5889ee0a369e5916d5cf6e4ab0
font_01_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 21792 bytes
SHA-256: 3591f053147a4ecd7b43282c336ed4e6117f569297e9e3dd8c55dbccb8fb4f8e

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