Malicious PDF — malware analysis report

Static analysis result for SHA-256 3af853ae20869524…

MALICIOUS

PDF

85.1 KB Created: 2021-09-05 22:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8b28b8fde8eb090de32e049f89d261e SHA-1: 7768812ad125769b6ed138c06252f47ecb09adca SHA-256: 3af853ae2086952469bf7975ca30ec4aaae098c2b1c30bb72cd7d93be5fdb1c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of external URIs and compromised CMS uploads indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.d-table.com/wp-content/plugins/super-forms/uploads/php/files/93834343edd5df70e5ef9090eac4ff4a/bogiwimogopes.pdf In PDF document text
    • http://wawa757.com/uploads/files/49438182082.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce0708e7d8---widiliseb.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/beluvexonewivo.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05b21d181b---31128477333.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac3084b531---xukilidavojoteg.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5kd708t76dvpulc849nl048g5g/40909882181.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be1102a765a---fopajofitibukupebabani.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/xodomabox.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/6de588cd9b07e0072f85876e42ee6301/fakojomereviwoxovi.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/97893763338.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/88907138872.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bca9e44b1953605f2140a790cccc7c41/81136471837.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ddi17q36lj7hfh92c3rmb3na8r/96777420212.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/13893286561.pdfIn PDF document text
    • https://quizai.com/uploads/files/82530124682.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jomomo.pdfIn PDF document text
    • http://builderall.info/userfiles/file/51252028753.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607658a1bdfa5---xuwexivuvaf.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pinerenupigeruvudaxax.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160ec459223532---tesabaluruvewebuzafevuvil.pdfIn PDF document text
    • http://nakatka.com/files/file/38184922993.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/sumumo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/62512061900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=2014+dodge+charger+srt8+owners+manualPDF 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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 11396 bytes
SHA-256: 1305a946cecc35f4b3c9de0f80e802076bdedc0b0f4affca627d24f3ff095851
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 17540 bytes
SHA-256: 6ded10e6dcf95f7d38b3b6ce85ac231df4cfd5131628e30744ff926cd81568e6
font_02_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1