Malicious PDF — malware analysis report

Static analysis result for SHA-256 e19117fe1fcaba57…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 14:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 10f8e3e6cfcc02c2af94152b3525a0b7 SHA-1: a17530ea5da8e2d96c1598b3b12d597f2427bb63 SHA-256: e19117fe1fcaba57e4a6e66370157707a65cdbcbbafc8ea00585c3c31b2a56a2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'link farm' heuristic and URLs hosted on compromised CMS platforms strongly suggests a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

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://pixomot.ru/uplcv?utm_term=3d+live+wallpapers+download+for+pc PDF link annotation
    • http://investgeorgia.ge/userfiles/file/42983197443.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/27213073836.pdfIn PDF document text
    • http://sinostandards.net/upload/files/62785741669.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/161316d21cf297---jadifobepejafa.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39994753322.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/39262972248.pdfIn PDF document text
    • http://bscartridge.com/pic/kumil.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/19329357176.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/gamobarorulixesuzi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc72fe6c84.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/50579756982.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/fufevimogotif.pdfIn PDF document text
    • http://gzwep.com/img/file/2021912232223.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/kurawabam.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/bopajajob.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/juxajitojoxusumalusotuza.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135deeb359f2---10115950172.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/56736652057.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/mesaxiku.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/vajimodagadapix.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/fivifafadonidulesa.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210912110935_1633990637.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210907023158.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/fefazosafimeji.pdfIn PDF document text
    • 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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 10740 bytes
SHA-256: bd8c8065d15ee1482d9cd008d45a07d0f7a0ecbe084a0ecdb1fae426a3f77b07
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 18120 bytes
SHA-256: ae9816fc4001fcc2d5d7841e6eeae7c78e279c68c9c81e13a18f268e0801ca5b