Malicious PDF — malware analysis report

Static analysis result for SHA-256 798889d5a82c5b61…

MALICIOUS

PDF

75.9 KB Created: 2021-08-13 20:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3de576bbdb3b8c293c593a740dd8e4fb SHA-1: bb7fe927f2190a72f984d62f6277acb916378b85 SHA-256: 798889d5a82c5b615fddd6fb0444206807e8700a8c2051747e0ad3e7f2ebb615
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple distinct hosts and UTM parameters further supports this as a tactic for SEO manipulation or distributing malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085a46970177---81561534408.pdf In PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e6ed674357fcc7fd925844fe256ec628/60716943551.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/31477547310.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c660c09263899af8f7bbfca50a632ea6/goxeripawafixeganage.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d34d14d2b7049c16d6ad46b3176bd3e3/34888964243.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d49e8de9---nupilituvadigokaroder.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/c6s413jfuto1ir9pfpl8ogh19m/wabekonenixujiwapepul.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/74011190381.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/4584214115.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a429d515365---72983360272.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc5303270---xomatibejidovopodak.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ximilijuwedajijutezavu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/95372136327.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/53d978d30cd5a8739764aa48a5e58c22/28510282108.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/totajeku.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea14f63244---4906019707.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/605896ecbce8b987e0d70bb90b19c455/gemexofe.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/lotefeka.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/23m4042ihfj4208pvij5v7igob/40677030094.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/60278521098.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106152300556861.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/gusalinalujilevoles.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/vefesiwejugixuwebonaxive.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160fdfe70cfc9c---37942557808.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/rinigufilalide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=consonant+blends+worksheets+for+grade+3+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC362 17456 bytes
SHA-256: 9b93eb70d0b998d8e3b1dab53e51d04806428769416ad7c4305e0377752ed4eb
font_01_sfnt_off0000eeae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAE 11208 bytes
SHA-256: de1dffc6a7c901c43b2bd5a2f92849e044fae35a38cc456fa8516246e2e3417b
font_02_sfnt_off000108a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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