Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f7234bd67a194…

MALICIOUS

PDF

81.0 KB Created: 2021-09-07 00:45:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 403783cf226b8ee9e9fdfa1e80d1bbee SHA-1: 8fdd93bff10b8ddf920403bee28b2bd8cb312627 SHA-256: ac4f7234bd67a194d266857ef725c47e51a9f7cca9e407c0f8250cfb77019ede
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and link farm characteristics are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd432f5a9bd---51690652808.pdf In PDF document text
    • http://chochosanencino.com/uploads/files/12270728641.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b1ca70821---lejumejogezugogasu.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/42915558736.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/vigemotevuzamoj.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/cqd5iogkm7lksf5o3n0p8ont87/61039477665.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/sirabeveka.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210708155300773.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ae5fb947a---89875359476.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/n93r88jvndcmfacibbrbt2h763/63286202405.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/palupunejizewawezi.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/51cuq2i7ravt7j7hjrnmjhd0ee/82462969462.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/93838387247.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/sewexenejefunebeguwoxafe.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/jawomedonebejarusagop.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/62181447783.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/66074706179.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/c0b84437e9df6d2a095a4d63448f7595/livemoloburog.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/12033056745.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/261074665f81f25c09364b2a26e595fa/23518944820.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/lubuturetezupijutiso.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/252e693dbc130a297c45532638045c1f/45828578725.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4804bcc0e---89857349482.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607181e07d04b---25065442517.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083613b8cc29---dexeramejotozuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sportster+parts+manual+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_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 17980 bytes
SHA-256: 7eab887435a594c89dd43ac88298a84b950d505ffe0541d480ade7592441b798
font_01_sfnt_off00010530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10530 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 10744 bytes
SHA-256: 4ddc49baf28e74651ecd1c6fce8ea804d0c3fe1472a3d48e3c3ebe0d9f18cae9