Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c7c00de2c52fe9…

MALICIOUS

PDF

109.1 KB Created: 2021-06-28 23:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 743231805262929df89a3d3cb21d5491 SHA-1: 82c5d194e09d1b5df77c62d1f3e2c5913ff1785c SHA-256: 35c7c00de2c52fe914b9bac1d5518ecc7d2ed14dd7b9f53abdcbbaa1da5bd1a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://catamma.ru/uplcv?utm_term=how+to+get+a+sharpness+100+sword+in+minecraft PDF link annotation
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e710f752e1---xixovofidujivib.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d1db3726736---tojalelusej.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4f0329d3a---lelijoxaf.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/xasugaluwuvajutiket.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba14f6035e---nofuzakajawawigaze.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160724945ddd77---jezilixixe.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24ee3a0ecd---16178191576.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/47438654581.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6sv04ub4iako7epfga15s4cq23/bajafa.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f40c1a601---34197894058.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/lsvo67g1cskjf72nqcbt30klsf/tipivijejimotutitux.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/48264987247.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/e6bcc68244d6907da7eb3dcbb8261808/xabapusuzesugabesebudiz.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/tafem.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/lrohgjcn5g74a4dsbqi0m0racp/3343007605.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/totupivak.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdb065244---rikojeza.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608785f338d7f---13311414708.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/78475728089.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/1a7fadc22663e9d18760b94e362354ff/46906914891.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q3mncop0fillbhnqtdon3e459b/nusasojikobawilura.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f893f96d64---15841951511.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_off00013dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 11272 bytes
SHA-256: 60c6cbd39f42949a8ccc1ea26492d5506e4958616db5038a16635c7e5db5705c
font_01_sfnt_off00015812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17024 20844 bytes
SHA-256: 56d1f28cd09bb5c6d293d01ee03b4f1b6752b2b3bbb2227c2ac322770814febc

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