Malicious PDF — malware analysis report

Static analysis result for SHA-256 703b0ca84eb5cdb8…

MALICIOUS

PDF

76.4 KB Created: 2021-08-01 08:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 57cd79151f269847b38f613ed287ac90 SHA-1: 823dcfbbe8dc9e5c5af9579f0ff6ee097d885726 SHA-256: 703b0ca84eb5cdb86b48d667e0e2f68735e3b6dab98238acc1e37ff3282bdd9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://ketchas.ru/uplcv?utm_term=descargar+libro+aprendizajes+clave+preescolar PDF link annotation
    • https://auto826.com/uploads/files/rusipowi.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd92d8970a1a26df300bd54a1ea41a54/sibonedonigezus.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072396958455---69258539255.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/25d328894f7050218091a005a9249807/laxip.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/87072320198.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/1140678527.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060414513473499.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cdafb2f4364b068a0c07caec0917f3c8/25817925185.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/38643430684.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/vazugeridar.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/10751e50b89f04bb2938168f76f67ad9/57152783030.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e57d5fd9e4d---xikusuwazuwutimipez.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/38142503717.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/d73n2ecjjoi8ktr25fa4666r3g/20839329084.pdfIn PDF document text
    • https://www.elguantedeoro.es//ckfinder/userfiles/files/46044198437.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/32cb798473ff1f8d9e52ab9494aa58d3/61616817079.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/134c098e784db0be0a1af60e5adc18ea/mezupepobaxaburozokevuzod.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/75516670692.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/fenexo.pdfIn PDF document text
    • https://promise-land.com/upload/file/90538090864.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608519bf386da---tosafuge.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/sagebegulemopuxekenituf.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/64408960727.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1440838f20---6644572930.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/refojezivoz.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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 10988 bytes
SHA-256: 3e5ef08470f3fd58b4cafdd2a386b109aff7574f2ce6e6cdb43436e03493169a
font_01_sfnt_off0000dc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 17652 bytes
SHA-256: abfc9323df904714bcfc6a1e7b07d44001a246b73409e8af7cfd4960b3eba012
font_02_sfnt_off000109c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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