Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f582913b04f94e1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 11:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 45460af346233db5558403f19891a9ca SHA-1: 81fe06a136b03b3a37052246b1ba3b8e74ffa838 SHA-256: 4f582913b04f94e1de4937efa93c9c41cc0f10e20477b3e83deda5be91d6baab
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of a QR code lure further indicates a phishing attempt, likely directing users to a malicious site for credential harvesting or malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=scan+barcode+di+iphone PDF link annotation
    • http://gat-asset.com/CKEdit/upload/files/51923348561.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • https://mmtours.si/uploads/90579392276.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f64ff2a093e4ca0041fe19112698341/8659989163.pdfIn PDF document text
    • http://hicoweld.com/shop/fck_file/file/74553943142.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/67806191809.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/94883602644.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/susojoj.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/xefibutujomul.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/jemidajelexilojevapo.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/tewerukomixixaruxam.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedad8179c---sibenefumemefunememin.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/lefukodaliwax.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/zopazirapubus.pdfIn PDF document text
    • http://chinahongji.com/d/files/roligimalosizowavis.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613beeccc97b1---rubixarev.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/libemedoxomarasu.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/1f7837debdccdbe1df81ab9fa980af10/28188940977.pdfIn PDF document text
    • http://kaies.net/upfiles/210907205601809088rvmtd4.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/firirumikugodagoxifa.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/kabilixe.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1240499625613e33b36a881.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/vljr1024035991a02bkepdte2b/mozatuxu.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132843b1b3ff---poxosem.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/93633161290.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/gowoxinejunefuzi.pdfIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF5 17180 bytes
SHA-256: aafac9419636cd11b220cd140571cca96d962a950a62427b4e4912a3083606c4
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 10516 bytes
SHA-256: 37f7aecba5fe122aa955cede34e2daf6b88d95cf69b20ea07b01e5e1965034c4

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