Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d35117aaac87d81…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 23:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a198c052b896abddb7bc12c18e3ee6d SHA-1: e585949d9243ec2106b041b9af6f46fd40258f20 SHA-256: 5d35117aaac87d816040256a62f8dca0ffd66e4a193595174cfe86043dc9ea89
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d7p7eqoe4vrq9jd5ncfvn82v77/7348481550.pdf In PDF document text
    • http://au-zlato.sk/upload/files/65277373685.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/83679431183.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/bsh8jod0jji8110hnf5ckcj7u7/45227816363.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608183288c099---pefaturolomalofebaduka.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/23446772157.pdfIn PDF document text
    • http://brukbet.com/user_images/file/ludosuwanar.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/56267620642.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i23d6k5ns5ck81l2lck4cuh657/gufukaxefaremam.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r6tk1lkva269jonqm79574t067/40573276891.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/fejorijerujesuwazisi.pdfIn PDF document text
    • http://euro520.net/userfiles/file/16233134401773679627.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/96939296355.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/oeuouor0oj08n0meaf8h0rvhec/46981344053.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/a6dba2b5c72ba1c0ccd39ec842906920/saboxe.pdfIn PDF document text
    • https://zhansq.cn/upload/file/fewavixawenaxewujifajep.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/92159052948.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925dc932d76---misoxigixizizuzob.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/tm24inb2i86tsu63jmd0g6h2i5/14564142951.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/29925033687.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/senalapadez.pdfIn PDF document text
    • https://rosycaffe.com/file/namaxo.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608295715aa4d---90391930974.pdfPDF link annotation
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=comprehension+passages+for+grade+5+with+questions+and+answersPDF 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_off0000bbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBDB 11396 bytes
SHA-256: 8ca0c6aff7e944db4510bcadee2f9f668baf76cdf24020c4d8bd36e8901daf7c
font_01_sfnt_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 15692 bytes
SHA-256: 3c9e430fa8b087f0ba339d2ddbb53727fbabd8efa659ff92f060ae0efc379c6d
font_02_sfnt_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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