Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f57c253211d3a1…

MALICIOUS

PDF

93.6 KB Created: 2021-08-13 00:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 801f5a3672b37bd1c53fa593d88b095a SHA-1: 501044804bdd1177e8977e3f43de92e9e45a2883 SHA-256: 45f57c253211d3a142d4e6c70070dd5d22874a5a1d492acf87f3483178c287f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://homenet-spb.ru/userfiles/file/26805661793.pdf In PDF document text
    • http://shuimotongyuan.com/userfiles/file/94762363696.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/lp694jtc9p6p95n7q4dslc18b0/19962750564.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161119d0d844c9---bosesezibawelinakasow.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82278ac5e---lepokukovipokazumoxixalez.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/lewiro.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/54811875798.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0d9372f4f62823d14f4bf0652e9194b5/tuwaveda.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/vujinenosebutusale.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de88d760021---wimumoguxejuvijuf.pdfIn PDF document text
    • http://e-district.org/userfiles/file/sibasesejixezokikutaponix.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c880173bbb6---mimofatodawaxez.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/69866391503.pdfIn PDF document text
    • http://www.celso.org/download/gefanidiga.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/zizulikubale.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/luu50lvdminndns9e09am43quf/78176040192.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/48434650399.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/xelazetodasagime.pdfIn PDF document text
    • http://www.amanuttarakhand.org/ckfinder/userfiles/files/jemupebujudofozotuludaku.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/rurolagege.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/26579773605.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d559a9006630fb2cdb23ccebbf957989/zibumuregosi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/o5j5dsvpiic8k6ok4hcae9j53m/34942890035.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/87031167370f8d697c3ce427c1a2adc0/98992393699.pdfIn PDF document text
    • https://ocw.tw/uploads/files/sezexuxumasen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=neo+geo+games+free+download+for+pc+windows+7+32+bitPDF link annotation
    • http://s250801404.onlinehome.fr/img/uploaded/file/witevumenek.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_off0001074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074C 17416 bytes
SHA-256: a9fcb451b741453dc4d70fca76c105d66d8289503ee3845ddc42f4bcf518eb81
font_01_sfnt_off00013515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13515 11508 bytes
SHA-256: 31bd928b18a784376c1e2ad7004b128161d55b5cb91bc9a432b33b52fd52fe91
font_02_sfnt_off0001501a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1