Malicious PDF — malware analysis report

Static analysis result for SHA-256 3416fdd129d28590…

MALICIOUS

PDF

73.9 KB Created: 2021-10-03 21:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 060c9d1b06f7758292eab8601a18071a SHA-1: 05f9e7cba95e1314e5ff5c870da50a0de5ae2b43 SHA-256: 3416fdd129d28590d05a9ec5364090fc9feffb0b13920a483127d9efa337d48d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting it's designed to lure users to external sites. The embedded URLs, while some are marked benign, are part of a broader pattern of redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4b88e406193525fe61097b4bb8b7f052/72002468777.pdf In PDF document text
    • http://nc-israel.ru/upload/files/miwelegipelobaxode.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/75385282805.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/sedexiso.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/25506937406.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-27/20210927140612696853.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/6763951970.pdfIn PDF document text
    • http://wych123.com/upload/files/kurobog.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/92923824988.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/72168752410.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/81281902345.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/jujunenadebudotit.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fokobakotura.pdfIn PDF document text
    • http://birdwatching.sk/media/file/22018479169.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/42828393997.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/vokarusawubowologu.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2fcc33423---wuripupuzizog.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6145aec4809c8.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/jadogexemoni.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd4340e6aa---zazutepisovufomukago.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/85940073035.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/bedugutezanapurara.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/magutoledofukujubanizevav.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/derumokigakekipesaxotoso.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/2367f04eb633c6d8bb7288194c75736f/41560579836.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/e9ce953c61e36cd2a4b8be2843b654a5/zovatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=clogher+diocese+mass+onlinePDF 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_off0000b8e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E1 18480 bytes
SHA-256: 31545244a22f89ba5f6224dc47526eaa9a679f6a9fe23e423923de2001cfb5b1
font_01_sfnt_off0000e8cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CF 10752 bytes
SHA-256: 7283eaa8bbd21d4af3d032ee61b1d22b23ef0134e320c42838fe07e00ba001ff
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1