Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5eac39fad1a6be5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-20 18:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f09578bad4e9c59863cf1d2be60a40ae SHA-1: 444043b2ec2145dc0673f7cd1d70eeb1517230ed SHA-256: f5eac39fad1a6be57a786681bbd6540b59c5b4663dfbddc955b0d757ce09752d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of deceptive linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://poiskvod.ru/images/file/pipugup.pdf In PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/54278907949.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/67970339012.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021092004053370.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/ranedomamigil.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b76530f555f3c2bc7f200a182650075a/68860220106.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/wupanitixegibuwi.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/lowoxasaraxal.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109131921249739.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/82993963249.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/3186361842.pdfIn PDF document text
    • http://themadthinker.com/temp/vinney/HTML/userfiles/file/tuzadipabunuzatefo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vlr9depauqqcjdm473r5u4u5fc/buremipowixin.pdfIn PDF document text
    • http://itena.si/uporabnik/file/riritarewuzefejirew.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/mifubotopinemulone.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/80920038816.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/zubutavaselexakuroki.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c202d5c17---jaxedawozobafamorubedu.pdfIn PDF document text
    • https://ekransamara.ru/files/vumupizim.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/wabidugerepopetepisi.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/71466881379.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16130756932fa6---63787823081.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/wikakuwaxi.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a39d37773---68655676400.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/39224209381.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=can+i+transfer+photos+from+iphone+to+android+via+bluetoothPDF 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_off0000e0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B0 19288 bytes
SHA-256: 5646e5283da4e12bb1c6e0714e782ba02173fb891bca9192ca707cf597b75ce6
font_01_sfnt_off000111f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A09 11100 bytes
SHA-256: 52b3773f4b9b86e6beecb8fc7f93378598f80e4aadb26521294e1ad6a8418f59