Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c7298cbbfc27138…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 10:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82661046e9085fc69c4c6e8320ee8805 SHA-1: f57cbd9b9cb255b8d25668253f414b50cc8b76f6 SHA-256: 8c7298cbbfc2713827e3e7025de5dac71f288e9be97e29f9244e023dc18fd30f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of numerous external URIs and the 'link farm' heuristic strongly suggest a malicious intent to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160f3656c6be1c---fotepivej.pdf In PDF document text
    • https://dondepodemosir.com/userfiles/file/27886127097.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/tabuperukojurafoz.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce474aeb1cd---92861832775.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc6a68c971---65410504648.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/nigewaje.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/54658309837.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65d126d8e---64857297076.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d906b065a59---21383368414.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/31467787830.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/wadutepuvameweg.pdfIn PDF document text
    • http://jljemc.com/upload/files/legujimugomeboliduxolux.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/55606933471.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a649fa3e296---jotumedejuzetikixitir.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9lkia1mtmaac2h2gf0augkl4j0/zuketizopafizekuzafizudi.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d97845747e9adee477e132b885ca1064/93962710118.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129494d78d98---47091703311.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ed73e752---zozigizasa.pdfIn PDF document text
    • http://maduraigarlandshop.com/userfiles/file/92115902195.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d4cab9b4---97134853781.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/fubabuwig.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/54179180851.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ske4hpsb2agiardh9hprje31an/11132086040.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/e97b2e9b9f312afb1465fea9272c53b6/ziwafijitaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=orbit+sprinkler+design+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_off0000b65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 15160 bytes
SHA-256: c26b9dcb822e7164d1680c56906cfeda4ebdb0f5ad1031c593cc9bfe522f9884
font_02_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 10972 bytes
SHA-256: e603b9a804ecb465dfcfe93243272091c9f0a7e2d8fe789b1ed8ccb1006b6d5a

Open this report in the interactive analyzer, or submit your own file for analysis.