Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c8b56a23b235019…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 08:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0fcff93cbd154b49bbbc5e86e8e3668c SHA-1: a64caa79cc640bfde288c585a97def317188f80b SHA-256: 1c8b56a23b235019c0f9cde13cb2ef2739ba585f4459432a2bb48d24322f24d8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The heuristic firings indicate that the PDF acts as a link farm, directing users to compromised WordPress sites that host further malicious PDFs. This suggests the sample is designed to facilitate the download of additional malware, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a0d446d46e7491def7e51f3eeb6366b2/datukejunug.pdf In PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/pofisef.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/16855721950.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/7630963132.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/94334032933.pdfIn PDF document text
    • https://www.vek-bg.com/app/templates/js/ckfinder/userfiles/files/julede.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/89560502141.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/xilabilosimewagaduba.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/76782226558.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/65021098272.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740319aabd5---tozatojotawuronubem.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/susibepojeteripoje.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/o9u1275f8n1fuomm2q6tm3sudm/rikogegelanepo.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/mubuneriretowixufuxide.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/63616758134.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/wijifi.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/ditones.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160770724cc010---norira.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea66c46ab2---55019436576.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/33075048747.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/43800230694.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/wosizemiwo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jrbbu415memfv08esmlufp5e2l/datojumafonabazisipuboboz.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/ruderirupusikotizarogi.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d45791701be---48481364139.pdfIn PDF document text
    • http://quatden.vn/webroot/img/files/mevaletiki.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098351e2006a---niberaku.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/34776160743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=7+years+old+remix+sik+worldPDF 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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 18356 bytes
SHA-256: d06fc735c2701955ee4601bb64e24a55b53e8981d422caedf6eac37a386dc374
font_01_sfnt_off00010fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FDB 10556 bytes
SHA-256: f4b970d8e79c46ea90c539f0dc9d928a6eb9e15dd6da89f63c47f045f5031cca
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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