Malicious PDF — malware analysis report

Static analysis result for SHA-256 997ad4fe28b2aa23…

MALICIOUS

PDF

71.7 KB Created: 2021-09-24 22:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e4780ff9d473d500d6c58fc5d5b26372 SHA-1: dd2b7b103b42d42be6b3ff9b1412ec9d8d618765 SHA-256: 997ad4fe28b2aa2376b8ed9da1eaa8a7b38a701989a3324368da8a64760d93eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The embedded URLs, such as 'https://oniceh.ru/uplcv?utm_term=iphone+7+plus+128gb+price+in+america', suggest a phishing or scam lure, likely aiming to harvest credentials or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=iphone+7+plus+128gb+price+in+america PDF link annotation
    • https://irepairplus.nl/app/webroot/files/userfiles/files/ladifomefamozarevi.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/luwevubefubodalipowenibeb.pdfIn PDF document text
    • http://synphabase.ch/upload/file/jezajugitefokujela.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/mafanematogikiguseg.pdfIn PDF document text
    • https://alpinashop.bg/files/busosisovigem.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/wurukojusisen.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/88173482736.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210914_05C3A6A25718F63A.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8e298418---levovogujexifapogo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/91476942847.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16145e0cbbbc5f---45607904667.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/70196235061.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/99608040626.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/kulinugorafefesatadajog.pdfIn PDF document text
    • https://castel.ro/userfiles/file/kuxifo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/o3vjikkgb7k1kalf1sj5ggbp20/26899057316.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/14913147913.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fatezudopa.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109051655098127.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/38499706192.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/72997397147.pdfIn PDF document text
    • http://travel-door.com/userfiles/file/zobigukovepurobogubiperu.pdfIn PDF document text
    • http://technocom.pl/editor/file/demalefixuwora.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_off0000b24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA66 11344 bytes
SHA-256: bc7bfe48ba6fa478604d6e2d23d028dfcac1e25da1e799bc42be89f41897d759
font_02_sfnt_off0000e4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CE 17148 bytes
SHA-256: 804cad03e4f87355b4cd98763e53369422bc61d83b34a08747fe71e9234b6d19