Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2574def553f4e94…

MALICIOUS

PDF

89.7 KB Created: 2021-08-14 21:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d15d839704344daac8ef83e54807232b SHA-1: 69759f928cc2a8fb4834da72180cec38ec707564 SHA-256: e2574def553f4e9462d649e235b686965e5edd3c74a9cdfe8321ba758fc26ee2
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites, many of which are hosted on disposable domains. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to malicious content. No scripts were extracted, but the overall pattern is consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae83558dd---54848832290.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed38a899d---95622007704.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f33b2a636b---xodarovirotib.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088042b140b8---lisumikus.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/suwisaweluwaboke.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a2c713dbc---93166975337.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/baveruligaxu.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/ranokeror.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160bf98ea3e535---walogupizikulidakonuruvad.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/kk8c23t3flesutum61om9ng2fs/63689212348.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b303e9e7d6---mofedumigamukonezureneli.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/dodikusunagig.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a394b7791---tofudutofetazafavidujonix.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/tixuwawejotumeleze.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7be16dd8a---61043982628.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/dotijufepikiwodemoxi.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609665297ec54---gujelizozomeda.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/nizufobepawof.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/binetofokotimituvera.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ojr8k8hj1hpesg33toh9g79v60/pabulibot.pdfIn PDF document text
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/woregulepaluderakajupo.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/38176735860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=asus+usb2+0+0.3+m+uvc+webcam+driver+windows+10PDF link annotation
    • 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_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16004 bytes
SHA-256: e43d0af16f0352ba90e97b260e9aab90864e0735533c6434e9e4d57f2b7b2b7c
font_02_sfnt_off00013d92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D92 11292 bytes
SHA-256: dc64fbeca711508c3c422bacf9a56e27478da8e871a2e096842672386ecb40ea

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