Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a783da9cc0cd2a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-14 17:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c5222b77423d7815b5a154899aba9703 SHA-1: 44a12937b87c528a92586877d30b76338976b62f SHA-256: 16a783da9cc0cd2a1aa8db04f5fff430aff43685e89fe430f5f3528159a1a1d5
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to external URLs, some hosted on potentially compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://gamecoast.by/uploads/files/pisavaririvixadu.pdf
    • http://asijskepotraviny.cz/files/file/zesusemizojimefetirun.pdf
    • http://studiobardinisrl.com/userfiles/files/28930565763.pdf
    • http://aimic.com/userfiles/file/tupoporalepig.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/8841728053.pdf
    • http://ros.by/ckfinder/userfiles/files/kitufevebezulonewixigovin.pdf
    • https://aymexco.eu/ckfinder/userfiles/files/97103594066.pdf
    • http://leeclinic.kr/userData/board/file/77334076218.pdf
    • https://creativitagh.com/pevron/www/img/file/73554405278.pdf
    • http://www.florentmaussion.net/userfiles/File/fidagunimeg.pdf
    • http://selfmadefilms.nl/userfiles/files/10964948281.pdf
    • http://ibb-online.ru/f/file/sugasemo.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161404bcf662b0---60734274159.pdf
    • http://vonschickenconcord.com/uploads/files/rewuvurotopekaxan.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1d9d10---matifawo.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/86t8db50hj3oolsdp1nj9e83j2/jivakekilexawexatiwesoj.pdf
    • https://kuni.ro/app/webroot/files/userfiles/files/dotifoxexetesupexudelux.pdf
    • http://shijijiaming.cn/filespath/files/20210905165046.pdf
    • http://asbufestival.com/uploads/FCK_files/file/98023342590.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdbb583ae2---demopirexi.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/puburas.pdf
    • http://platcometals.com/images/file/33897120841.pdf
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff81c6e19d---kavofox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fnaf+free+roam+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_off0000db81.bin
64fec0c6d206eb88e6307b6fff1bd1ae2b32d241a16a23e9e1463d40b5cab332
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 21188 bytes
font_01_sfnt_off00011261.bin
d7b6c80e4c0b3ab4b0daae7428c63da7e906e55776e007296e4a873f5b524f30
pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 10180 bytes
font_02_sfnt_off0001290f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 16792 bytes