Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ec4951c7bcf6cd…

MALICIOUS

PDF

81.4 KB Created: 2021-06-30 03:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 411b4de7cec860d59f0ae93614fb6fe6 SHA-1: 0173963c0a2f1b45ade952811781a9b629259ff1 SHA-256: 02ec4951c7bcf6cd99e5a6db0c39d4dfb2b74e3950bc4c76090670f8c2d05eb7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Numerous heuristics identified links to external URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded links and the nature of the heuristics point towards a spearphishing attachment as the likely attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ckmandarin.com/uploads/sufamebav.pdf In PDF document text
    • https://jamurgoreng.net/contents//files/79824245599.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/85490441630.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ecaae00c---lezarin.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/37e6eabb85ce351ca3a1556a43ef3c36/99762172846.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095fe1eb57be---xemimazezodozumubosisi.pdfIn PDF document text
    • http://nature-revive.org/files/file/fifukodugumubezepotelu.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67ef20ccc---97674654427.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/o53pcrna6ok7ou36b6dqjnirmu/zalugara.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/49724359932.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/f068e827e2cb8573c454c77588ce9329/50292576553.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cef89698955---disesuruwasi.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/safenegeziso.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/72688007806.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/jamagulexirofipikunagoza.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/oc26f8emu8ka8dksnhvdta80p7/30245347746.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/fawos.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/866509039c46d85748b1664ad11d00ed/nekewezemobisadewilijag.pdfIn PDF document text
    • https://activepymes.com/pub/file/luwizafomasabuk.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/tj2e79emg1p3qa1tspmid1ate5/kazafopi.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/zopigokagenos.pdfIn PDF document text
    • https://agatanorek.com/files/file/11447102228.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/pasokoze.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166aa56313---jusodazitovonimil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=differentiate+the+function+calculatorPDF 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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 10364 bytes
SHA-256: 27c12cb0572faf9ee4bccd4337bd0dd639eee8510f9cfa1c36e77ffdda0efec7
font_02_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 17128 bytes
SHA-256: c958459445c035852a7537a27a279ce95d4d70aa814f1df371567a3d26674c1d

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