Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec3fcad79d089e0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 21:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62d0f0dbfd22c277d6da907489d6494e SHA-1: 3e8c064b819a045e80a244d81c731e45e619b3b9 SHA-256: 6ec3fcad79d089e0b462ef83abb20b89bbf129078054834f123abb213fb82102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nowator-zpu.pl/userfiles/file/rerok.pdf In PDF document text
    • http://nickels.design/ckfinder/userfiles/files/53115875186.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/semesekoregunesabotidu.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/zokibumagavixero.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/60533401312.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161089fa275dea---39209664708.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bc09786b---55024205198.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a715ceacaa4---56284271984.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/kemoded.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/69561290359.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/81079614303.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/xevibatexevanatatezapu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c34ab3245---gizopufadopirojutejewiloz.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/30359bf52d1281c23dca9f01558ae9f4/rezelejolilulobizoxosaka.pdfIn PDF document text
    • https://afayl.com/userfiles/file/69283625656.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab995ae3b---9236448837.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac649593804---jejupomuxipogaxunakaxal.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/zedigozujugig.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/tiwenejuposanupovu.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/zikuwaboburitolarekor.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_085716_131.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a790253426---xedowikobadapuse.pdfIn PDF document text
    • http://skncn.com/u/files/87275828191.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0e4e7a4f---81101213326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=fraction+decimal+millimeter+chart+pdfPDF 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_off0000d63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63A 18648 bytes
SHA-256: b1e473a0874eca99cd0734e5c8efaeeae77ee5b7d8bf5879d30306bf8258894e
font_01_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 10692 bytes
SHA-256: 1f109a9d790b78ad81de6ee60a695cba45416221debf5be028b1fe8f1e3adc6f
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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