Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7bf163a201b890e…

MALICIOUS

PDF

72.8 KB Created: 2021-09-17 02:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e4f2908d1c40498456d5fc7874caa55 SHA-1: 0ff7fdf1a79460fa0c0f506aedf989169b048383 SHA-256: f7bf163a201b890e3dec0c243468d9de965a97c7eda258ca2580cca04d457494
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to lure victims to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://orsam.org.tr/paketler/ckfinder/dosyalar/files/11267629801.pdf In PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/6185df2c0e466a29344fadd5475fef65/ronatunanixexa.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c720dd57e1ef01812c83f85ca04cd094/90919963022.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a83d1a1f0a---xudopisosilozedefavexaw.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/vabovovebujixu.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/gabimive.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/25662514948.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/zemam.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/zogojuvemowesul.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/jonarutopa.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/31618767419.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/db091c9856b60061b9d1a6ece5ad01d4/tiborabadi.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/82154018751.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32095078951.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/45468055559.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/65626042700.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-4/20210904213639981786.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/kutizenemo.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/65727782891.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/18328fa45dec3445c666ab2a301cafe3/wolikadogivifokirojifibib.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210913024828.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021091020503546.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/69022982347.pdfIn PDF document text
    • http://etkenkalip.com/files/98571750254.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/tupopesopevutefiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=vidmate+audio+song+download+appPDF 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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 15836 bytes
SHA-256: 8666e0699e14ee132c8105de6819c0db42e7448476a2ee7b6f87d50530611ab3
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 10788 bytes
SHA-256: c1d8539fc160a809bb43d2386d199ef16dbe95f728576c12b85facfeb0abf636
font_02_sfnt_off0000fd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1