Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f2243c4d631864f…

MALICIOUS

PDF

84.4 KB Created: 2021-06-25 23:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a612a6088692e9fad1e0c83aa7ffbf4e SHA-1: f9fb3426026e3b995c882f914437be4df9c0fb2e SHA-256: 6f2243c4d631864fee74fb84310dcb49eec21443cb71a074cdf8394f0413871b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or malware distribution attempt. The file contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a visual download button lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=ntpc+chemistry+previous+question+papers
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/2l6jbs74n5s7t3ibvvek42mbs6/sopidukunup.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62d448efd---juvinolipepi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608776724f14c---53734936621.pdf
    • http://araonline.hu/uploads/file/rutepogamatogilofipami.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/891153277284a36b767f980242f906de/fagogupukamenizofe.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/kiterasomorelenopazemavi.pdf
    • https://namratalakhotia.com/userfiles/files/6218026329.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0v3r0nptln9crs8o9nk3tu27jj/sopatad.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/4640477084.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705f8b00cc1---79203414959.pdf
    • http://vuatoyen.com/uploads/userfiles/file/27326865548.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8befdc14cd---99846548495.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/ehro1ke7s5h7e67em9hqq4i7f3/bofusenarasoxuwulabovij.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/231adae4f6ae5d5e4e4d85f7ab72a22a/xezafegojefitoxol.pdf
    • https://chmelo.hu/sites/default/files/file/lemosalowodopinupen.pdf
    • http://yoron.net/up/files/kurazed.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160772aad2c89f---sozegovoweroxarete.pdf
    • http://targhevaticane.it/userfiles/files/kukaxopixatimibema.pdf
    • http://scheiden-maassluis.nl/uploads//file/damaw.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/4ac372c1624d601865430823f3f4bae3/19853913082.pdf
    • https://ahreco.com/uploads/news_file/tadakifusowisixexov.pdf
    • http://veraschwemmle.de/fckdata/file/rumuxobidubufidejikid.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca5f80b1e---retinizadavi.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160abf75f0097b---33819526586.pdf
    • https://askisan.com/upload/ckfinder/files/texif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cb.bin
ea0b4a80131b58300204a1bcbcc0a2088b8e128079a7693e9d38a76c72449ae4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CB 18632 bytes
font_01_sfnt_off0001108a.bin
d4f5e8253c3107c79cc4a8db4206918957d35b918ce55a318834f812275240b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1108A 10996 bytes
font_02_sfnt_off00012a05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A05 16792 bytes