Malicious PDF — malware analysis report

Static analysis result for SHA-256 c877f9e3264856e4…

MALICIOUS

PDF

86.8 KB Created: 2021-07-14 04:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ffc0acfbf8fa124c7de92edfccef160f SHA-1: 657c541eb08c51eca2cc4c7ef9a9b656bbbfebdc SHA-256: c877f9e3264856e4b53290470b196590c3c0b0bf67202fc672cb13fb853946ab
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on redirecting users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://denimder.org/resimler/files/99610785404.pdf In PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/43f42bf11abd011110639d353e897e9e/jogajujovadizumaxajavex.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/436ece6b4f8f263e0581b8f973345455/nosodebusawumajabosorob.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/ripetom.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/42650145072.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ff5c5839f---53388839585.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/babokiv.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/71186633582.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/nekoziwujagis.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/rum10mveruo5hcflio2bvt8ogd/37287004485.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95a7f4f88b---juxubitukopilolivuze.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41f2487829---mujiwikezijofananegoj.pdfIn PDF document text
    • https://daismene.it/file/88773690498.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/71310654271.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75b7e7c1cb96ef3db4e3ae16362388cd/kepepeja.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984eb91fa4e---xanudodexer.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f997210b1---2173914552.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/57f4bcc4rui9s2trshkse4h850/61574896509.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/90807481999.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/20818017403.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/80m2gujjikvijn7id5s8n8o626/59516631363.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/59892973793.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b458db86fc---surudu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+deleted+messages+in+instagramPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF130 16892 bytes
SHA-256: 5dfdbbeedd7f6950f346ad48a661f7f9ffc3c612419fb351a8f9426013223f1d
font_01_sfnt_off00011d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D53 10772 bytes
SHA-256: b51359055324646e6a69c7d055f90339ee55482cd1557f0952a5f96e0aaba1c8
font_02_sfnt_off000135e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.