Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c14cdb886b8ee20…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 03:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b05dcb7fdf7f935ec0de754958cc1fa SHA-1: c614210102fc0b12018e5c2ca4106904c4a6828d SHA-256: 6c14cdb886b8ee20fc59976f17afae872e1ec68e66569f48495499f825e1d648
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm on disposable hosting further supports its use in malicious 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://pistant.ru/uplcv?utm_term=ap+physics+2+multiple+choice+pdf PDF link annotation
    • http://varadimasszazs.hu/uploads/files/27654094381.pdfIn PDF document text
    • https://dptech.vn/uploads/files/48956140792.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/14845069030.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/96293047502.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/f153bdde9ee73587a0a902286d1875c7/27272764825.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/fc513ae4b81d4c2a2354b065610c7888/65539847129.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/kigizufikupepimima.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161454543d4e90---66629436401.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/45983410199.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3fe5fcb3---38209780042.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/mawujalinidoxup.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fe542163---2268544119.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/lisadigojogur.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/33909963727.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613966f8e8977---ruzekizebilelagine.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/24340827251.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a154a1925---fekemosatifepewo.pdfIn PDF document text
    • http://labradory.pl/file/84857415240.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/32429266821.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/98490940583.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/17166467073.pdfIn PDF document text
    • https://abss.pt/userfiles/file/mupakep.pdfIn PDF document text
    • https://ons-station.com/editor_upload/file/82731972774.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/firosatoxekadetuwazitex.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 10836 bytes
SHA-256: 876ccf601806d99744b6d5307ea2ee28ffe00b07379c12e1209becd0c1ce166c
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 18056 bytes
SHA-256: e189a451dc6c8fa012a83f18861971958e908cd08c056375007d880cf4fa6702
font_02_sfnt_off000122f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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