Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3778511b32f7f55…

MALICIOUS

PDF

95.6 KB Created: 2021-08-01 20:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 270d72c02a96fa1d51c54a68086c6193 SHA-1: 4d05d09a75f17329b91bcb4a4efdba22f5dd921d SHA-256: b3778511b32f7f55758f19e1f99c414d9e27de49af46dacd24a73edf41f09120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of embedded JavaScript, though not fully detailed, suggests an attempt to execute malicious code or facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://irlanc.ru/uplcv?utm_term=delf+a1+exercices+compr%C3%A9hension+%C3%A9crite+pdf PDF link annotation
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845f3028e6f---rarerumajebojakokaju.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf68ad2d---42641433294.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/qmac53hpl92rodu4u45tt7oj7b/87361206444.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/1jcne1njkhetgqu3a9md2t8bd4/20833848311.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b083645c73e---24144128183.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/fudafulinajiwifaninixib.pdfIn PDF document text
    • http://vodnik48.ru/content/file/mubov.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/39692035553.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gerolel.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/76681950441.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b3a34c10---67842293921.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/31258677415.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/93520394369.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/norokiwitujomevivixofan.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac5dcc9b0---15948140302.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3a464ecb---69084396434.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082bb1983449---35956763265.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/frqnc35343272oab5599ach9td/38926665212.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/aa140afab2ab54e074e6a99f4aa3f03e/vetiruxonufitawi.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2ee19a564---48497992842.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb077a305a---pedavofumu.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/85312747973.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/19fbe73e8b1226099f16c25c760e29a5/sudurakapagiveruxabezot.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/gqtmgpgt47qk6v7qf50hdknqgi/bovewumogimarorawikezixes.pdfIn PDF document text
    • https://ecole.aa-e.org/wp-content/uploads/2021/04/exemple-1-sujIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 16204 bytes
SHA-256: 2f37ea1b11ece644fef2f420fc5d5e29c860255d372ec3a711666e2589675489
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 19200 bytes
SHA-256: 6d535fd6e6ca88da3a68677c6e61decff879531abeeeb74391930ffb2464ce91
font_03_sfnt_off00015372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15372 11192 bytes
SHA-256: 365dc9f15c98745eebda9cfcbb7906737ce964e325c39488d5b81335d8bc47fc

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