Malicious PDF — malware analysis report

Static analysis result for SHA-256 284af03916a1e08a…

MALICIOUS

PDF

78.5 KB Created: 2021-09-12 22:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2b0b4bfcfb839112aa63ce510c68be8a SHA-1: 7bf91509ba1eb522ce013614896f3c1a508a3527 SHA-256: 284af03916a1e08ad0798ea7faf4cb6d63998ae7137c512c47f2110a5728b482
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links directed to compromised CMS upload storage. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=how+to+make+live+wallpaper+for+ipad PDF link annotation
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/koxasiwisusufup.pdfIn PDF document text
    • http://favourtec.com/attachment/file/19750183551.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/95333133320.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/kadoxojobusadobitux.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/kifen.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/22347845204.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f31276980---zexeseko.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/lumadizow.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/pafewutalujagesemob.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/97658388033.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/94699254432.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/kejikimizor.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec5ed1505---73314385846.pdfIn PDF document text
    • http://opsir.eu/files/file/jelidigir.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/pebapefokajojazefodaboda.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jobezale.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a53e05cc---dodofuwitijo.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/fizorufa.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/bagezekos.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_off0000cf5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5C 10620 bytes
SHA-256: a0ecbcab14d3735aec223c75e7a4111829550882f2fd513ef9dc9f20da0e315a
font_01_sfnt_off0000e79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79E 17496 bytes
SHA-256: 13b7f34e560d64814144caacb778bd4596818a6d76c4b5a7cb4791e8be2196ad
font_02_sfnt_off000114ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1