Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4518af988e820c2…

MALICIOUS

PDF

77.6 KB Created: 2021-07-10 10:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 485f96db1f7b13e0988227dfcfac94f3 SHA-1: 4759d8ae7b7f00e4254f9c9dc363283efecfe821 SHA-256: f4518af988e820c2ecf54b9800bb0f7b170fe94b1426fdd6cc9d4f034c4be27f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o1oi06ppqtah7a02ej8is4fc44/46669739815.pdf In PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8c94112c4242e7177f4f0ba1398cb234/tabugaxuwemudizimik.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608badd6666f1---7771127210.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/59146422354.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/jopilosemakod.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/dojijegaxobaxedojud.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c48aed4eb23---84725033817.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/xoxijuketedutozapunubotiv.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/wugafomilivumolekunogu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd8ef5a388---momizugedej.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/caa65f4ff321ba9041138a54eb0c2bcf/18215740193.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ef39ba5180b1314e3530b1dc00477372/joturaduz.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/75731267752.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/17dd2fd2cdea4c7ccf713c50d64a57b3/vitaganofaxumowo.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607735eb84432---nelimo.pdfIn PDF document text
    • http://chieucoingason.vn/files/veweladasasoxutixem.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af75c28e72e---gorebowasurobuwada.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/cfbb799f161f2cba3292cb940a624e9b/nozarozoxe.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091746f26e1b---7449063815.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d170204df3---gigejubaduxitoden.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/5e74a86f04cd090d3e494a15044e3156/pewutikegoguwumasiwevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+write+an+absolute+value+inequality+from+a+graphPDF 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_off0000c99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99B 11448 bytes
SHA-256: 2585c921c1a4a09d17ce712bdd2dec3e2c74f123514a1e54267d1ff513a5079e
font_01_sfnt_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 17084 bytes
SHA-256: c8555116d6d005fdc43e89fe76c78d78f7e5774e104442b642a46f05d683b398
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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