Malicious PDF — malware analysis report

Static analysis result for SHA-256 827bd92638650934…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 00:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65f1b576d465af4a5add185b95323be2 SHA-1: da3da4b9e74ca6d2ede5cd19f3e467b257e97ca4 SHA-256: 827bd9263865093400d03024cee65b01a11951e73ff32353b288673227124d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous external websites, many hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple links to potentially malicious content suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dfdtrading.sk/ckfinder/userfiles/files/31041228292.pdf
    • http://acrclubinversores.com/files/galeria/files/86123016626.pdf
    • http://nail-free.com/ckfinder/userfiles/files/xipobumonivonisesagid.pdf
    • https://kapefashion.com/files/files/83737045694.pdf
    • https://actorconseil.com/files/file/3757782420.pdf
    • http://hanart21.com/files/userfiles/file/wuwesuvefosuxijosaweku.pdf
    • https://rocksoliddesigns.biz/userfiles/file/1035443733.pdf
    • https://ags-car.60km.com/upload/files/10553999047.pdf
    • http://worldnaturalfood.com/image/upload/File/72523454737.pdf
    • https://koncnc.com/genelresimler/file/76416918080.pdf
    • http://dkstores.gr/userfiles/file/gariboral.pdf
    • http://avrig35.ro/uploads/fck_editor/file/folelapokivavodisibapiza.pdf
    • http://talesma.com/E/file/90041796569.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee5eaef3e0---52947024182.pdf
    • http://formel1vermietung.de/userfiles/file/70963272303.pdf
    • http://ikkosushi.com/uploads/files/mutezetivejatujetamalebu.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ce78211f2---lasakematadida.pdf
    • https://davaocarrental.com/images/file/tugixalabumojaxuvinejok.pdf
    • http://vswet.ru/f/60272054599.pdf
    • http://bamor.org/userfiles/file/titarewezurogeg.pdf
    • http://herningbadintra.dk/app/webroot/upload/files/janone.pdf
    • http://kanchanaspa.com/ckfinder/userfiles/files/71117917075.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e336f70256---nexogibirug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=onlyfans+hack+app+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 16792 bytes
font_01_sfnt_off0000fd6d.bin
74bb2affd48b17867818c2bf91e9ffc0b3a8a5ae9f205f0618477db3c3e833b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6D 17564 bytes
font_02_sfnt_off00012b32.bin
d1cfd989283373755cbd698c7d16cfc1be4569dcd1f1ca3c155f8fb4f61babff
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 10716 bytes