Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d1d9ea4a5f00e1…

MALICIOUS

PDF

68.7 KB Created: 2021-09-29 08:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48b219043564ccdf29ec421a0e8fb5c1 SHA-1: 0c89710d6897b2fca695503a8d77dbc112d65f4a SHA-256: a9d1d9ea4a5f00e168d4bdbe88c8cd6c2c3a0a6ce7ac5b759ffbbc94adda9b30
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple external URIs and links to compromised CMS uploads suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://drafthe.ru/uplcv?utm_term=bring+it+on+fight+to+the+finish+full+movie+online+free PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ceb4c2bc89---78950474709.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/fetaviwiriminafumoni.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/risonevenixefevufixetoj.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/36094628546.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/fuwepazupi.pdfIn PDF document text
    • http://www.toptehnik.si/images/pewos.pdfIn PDF document text
    • http://cloverdiamond.com/file/suvemidulatoge.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/66227278990.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/wevosogudaxopegasatur.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/77778675970.pdfIn PDF document text
    • https://safecampus.in/cmsCart/upload/file/fejerato.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/40652946973.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/6428317659.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/foxomokaxavu.pdfIn PDF document text
    • http://dytac.hk/userfiles/47103376242.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a5f25e2979246919497bf5048775c97f/fogez.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/betimimedumuko.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/18667082221.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/25792491575.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613163fd5edbe---85970624564.pdfIn PDF document text
    • https://equalland.com/uploads/File/17676516402.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_off0000ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9A 14972 bytes
SHA-256: a5fca5e48528295707907a7898e419f1b1c27bd3b03d5f6a02265c37fe9423e8
font_01_sfnt_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 10716 bytes
SHA-256: 357a20b6799bddc42c89f38b488267c0d90df3cc5b04c4ee910e0b1d72c29503
font_02_sfnt_off0000eab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1