Malicious PDF — malware analysis report

Static analysis result for SHA-256 98df1162fd867952…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 22:00:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f34b5ce721b95916eefef5637d24572a SHA-1: 089b87d9b79a98f9f931855e5343f4f230051b93 SHA-256: 98df1162fd86795229f9e461b03a59029f71bf16793406c383d9800e0979658f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/9b8b6007a68c2427afa93ce533b3ea6d/gosonosibedogiditid.pdf In PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0b563d3113863bcf0c3c7b12fee4eda0/bavivurikebasifixut.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/zoronufave.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052610081194.pdfIn PDF document text
    • https://people11people.com/uploads/File/lobijexapufijaduretawekez.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/45344949597.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/65573278974.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/d83d799ed179448ee2795f2bcc938c08/xaxoluwexijifazoxepugaf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e280847c4---xeviregojokuxumaji.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16086e0003d44b---88988914495.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c29707074bacc70b70fc5817aa17c94/zigaj.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/7216403069.pdfIn PDF document text
    • https://service-panev.com/userfiles/72046197406.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/bovide.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49245900670.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b609f520f4---16240479206.pdfIn PDF document text
    • https://506hlapeta.com/files/file/tabomuwinuzisusu.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/lotolexibosunepisaratat.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/791aa463c792030e828bc89327ad8e7a/43999703147.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/berilofimu.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/mifukuzejiriboxazez.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8316cf5b9---pigakupaja.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/47ea232be0dc791ef98c6246bb533c2e/92992991507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=heredity+and+environment+in+child+development+pdfPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 10888 bytes
SHA-256: 15fbd3a20b3ab5fb9db917a5f881ef288ac05392a6c3b3c68e13d39be9eb00f8
font_01_sfnt_off0000f458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 17508 bytes
SHA-256: f69c73f346ac4ce8401a9191340886ba870fccbd7978b9ec51e7b7c4afdee860

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