Malicious PDF — malware analysis report

Static analysis result for SHA-256 66277d3d55dfc58e…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 00:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fdbb7890af7ce715f79ada40f0ad75fb SHA-1: 1b4eb3a4fbd3fcc01084708c7d7f9d49bee1a36d SHA-256: 66277d3d55dfc58e39b8a5838ee9962109d63756de8b4c3e5e0ec6eea2e077e1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs, such as http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad74bb55d9---96944676823.pdf, are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/vmct7klrg4shsn2v5vuvhqv253/54633366757.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8993a3d4a1---powakusaxatamese.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/5gn3g517ov90cjlll83s3ogetd/piwojebusadelaxuxujuro.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee9b1d2510---8037962635.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/mitujexijodamad.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad74bb55d9---96944676823.pdfIn PDF document text
    • https://stopserv.ru/files/file/21770850491.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/widovefapa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/02d97980d5cda3cbc9106865a2153d15/bebiwefejosegigosu.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160af8c560e9e3---11895676685.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16076c133de2b1---piwolen.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/39et28rpahs4b6t6re72ut6oq4/38965049564.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae558107430---jokojofepozukumawiwamali.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/42484896140.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/rifumokulawawi.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/fikatepazovunobeliv.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/fokazufe.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kavatezepogolub.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a66c769ca03---71716144249.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/h0r4lnko80bv9pbg18l4hqr4m1/lenatixe.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/eda05a0cc6d078508f4f013eb4a83e7d/27124540271.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a40dd4d1c---zupupabijatofizur.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/58897808603.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/9b96bccf1393fd91ce57c0ff597a54d7/gisolixefuk.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/fmhgul292elmscpeqlcs5f9vu3/xowibe.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/36953486348.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/xadudupovaxijovejekemix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=logo+and+poster+designPDF 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_off000103a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A4 10480 bytes
SHA-256: 5fe2245295b13746629f944f5534cc412eca9bd54aedad247413096404ffaf43
font_01_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 17176 bytes
SHA-256: 5e3ad34c91fff62accdc05a97df9cc5efbf283a2429d48f3c5e7942a7a6d5d3d
font_02_sfnt_off00014845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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