Malicious PDF — malware analysis report

Static analysis result for SHA-256 225b34ab6f98ea1f…

MALICIOUS

PDF

84.1 KB Created: 2021-10-16 19:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 294c882e18464d1eb8e51fd50d87c9ec SHA-1: 1bb878b057df466fc8f14c6cacce95e3e0ea209a SHA-256: 225b34ab6f98ea1f8f7d92046f0f695e5519d216c2d9f0963133dc93454ca45e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to lure users to external sites. ClamAV and ML classifiers strongly indicate malicious intent, specifically classifying it as a phishing trojan. No scripts were extracted, but the structure and URL analysis are sufficient to determine its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://leresto-niort.fr/images/userfiles/files/40817232278.pdf In PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/91102517057.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/34264009200.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/85907825686.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161610d227b976---xepumasobivewizilopovinu.pdfIn PDF document text
    • https://suruburi.net/mm/file/gidunobotosekef.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/15329343318.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/ligawufuvipix.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/jiwaguxupod.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20211011_013637.pdfIn PDF document text
    • http://savemaxint.com/files/file/65166689983.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/59514678765.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/40655224116.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/zazimumenuxotazuseso.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/kuwonuludovumosopuno.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/11150298338.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/bajimigusiruruvalojufux.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/95548922704.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/fufudubevolusupamip.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9e0c1ef33c3668bee83480505c1fc3ea/32981463334.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/40786935590.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17291665451.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/moludabesoxagol.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f0c550e4c26dd5abe148ef33d26cafde/nilur.pdfIn PDF document text
    • http://trivio.it/userfiles/files/78053947349.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/2I9n2o-U8HI/uplcv?utm_term=gre+issue+essay+promptsPDF 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 10516 bytes
SHA-256: a55a3ce96b826a74a6e49aaa40608da452064e0d9de7b50957272bb0b534e8ad
font_01_sfnt_off0000fcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB9 17736 bytes
SHA-256: 224bd98cdb96b575609c7a61db0ea5cea1080df4cde6d2aaa33d991cfdc9ed38
font_02_sfnt_off00012ae7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1