Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f61c058811b894a…

MALICIOUS

PDF

85.1 KB Created: 2021-08-21 10:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7a73950cf48243510156df5a03bbe943 SHA-1: aa1bb8a2443efc00e42d1dfca426d1d1d0ee4c11 SHA-256: 5f61c058811b894a14ae6677f9ccea24aa64266bc2c5b2886d2bde4df23cc04b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://krisoc.ru/uplcv?utm_term=bruno+stair+lift+sre-2010+installation+manual PDF link annotation
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853f306adcc---resivilepipurosotinunodi.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/jodowid.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161046c12c2d50---24177548229.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/tojewegezimogafizufuj.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/pitejamotizenomugis.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083b3f6e4a3a---93195828478.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/95868684418.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2d6584c051930c8279d3e953ed59aa5c/21698976661.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/70605578755.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/86622168162.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/dopamefovaxutozi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd7ab03e86---30800181563.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/vunisamusunolazokunetap.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/pivorikefekizuwedeka.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/busodoxoxegasozimuv.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ko9b5sik6fs3mhsdlvlkg7grn5/92812304554.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4471b81361---funijadupazumexixovokobu.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/66721249619.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/xuvalaz.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/f538a722272fcf4475cc5742ef2857b9/gorazoz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ee763ee8813d3ca67a25ae050eff7754/54114544587.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tlrq2alcqkmrnmshptc5cljhs1/ruvafudawutixe.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/tifesoripapesin.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/nagejejomusamu.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tixirogin.pdfIn PDF document text
    • https://mmszke.hu/files/file/ratunexiter.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0b129723c---51701679151.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_off0000e80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 10856 bytes
SHA-256: 6334c1680a24840bbf56bb410df5239aebb1bf95750d9fa55c20e7649b3aef61
font_01_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 17000 bytes
SHA-256: b6a0d7f558f8ea5dc19afcb3bd64db4c209a414311ec196e9f2b00a40363706b
font_02_sfnt_off00012d04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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