Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00e94c82e4b124d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-25 06:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6148dda41d25ba3cf6282e02bf8da6d1 SHA-1: 81168c1c533c486d744128a930f5c85df7c09ca1 SHA-256: a00e94c82e4b124dcaf180f36539cdea62809023d19026400174ed18846e0444
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation through link farms. The embedded JavaScript is likely used to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149749f7df70---1303036419.pdf
    • http://ogledalata.bg/uploads/pages/files/xunusipuxifijovot.pdf
    • http://linkingpeople.info/userfiles/file/63145792195.pdf
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/5975067024.pdf
    • http://aftp.bg/userfiles/file/55247552730.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613782482b74c---kijisetadaporetodemenopuz.pdf
    • https://cleanenergy.mn/uploads/files/46431111394.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614afe54d3626---39653563396.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce9a8064b---25592055822.pdf
    • https://noihoithanhtuan.com/media/ftp/file/dilerexidiraronig.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/75007cf63ddd251ce8931cadba0e8d44/bivilokosarijetijato.pdf
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/vinimodibotizib.pdf
    • http://www.deco-interieure.com/userfiles/file/64326068902.pdf
    • http://stellarp.com/userfiles/files/jonetafaxagu.pdf
    • https://pkmoscow.ru/ckfinder/userfiles/files/16504373124.pdf
    • http://northamericaminingexpo.mininglifeonline.net/file/467tzyjFerYuA3vn.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/161407f472769b---gusogaditetuxiv.pdf
    • http://feynburg-uhren.de/uploads/juzogejasatakoni.pdf
    • https://ddc-touggourt.dz/ar/files/8791732475.pdf
    • http://www.awakohchang.com/image/upload/File/7803766082.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/93014999548.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6501ee1e5f28470218e4dca562c6515a/19940354093.pdf
    • http://say-international.eu/userfiles/file/2986058316.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+trade+in+shindo+life
    • 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_off0000c2b8.bin
a10eab0811c4aa0d52710de667ec430d0c37d652cbed5d551b717ba7f54ed98c
pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 10528 bytes
font_01_sfnt_off0000da9b.bin
34272e7d73af0aef162c73a4320ea3d52a1b9f4bb5e01632392aef4046f6834e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 19588 bytes
font_02_sfnt_off00010d90.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D90 16792 bytes