Malicious PDF — malware analysis report

Static analysis result for SHA-256 990775d53ac050d9…

MALICIOUS

PDF

84.2 KB Created: 2021-07-19 13:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9ce3cea2e66abd9c12dbef9b71f7a762 SHA-1: 90fdb86b82a0aa7c6c4ead1c66fa00177ff2a1dd SHA-256: 990775d53ac050d98824894a22a5f5fa7fcf30de2eefcd0503f4851b6f1426b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links on disposable hosting and the use of 'utm_term' parameters further support a campaign to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/3fb65eccfa34bc6887fb3097102f2afe/52263757861.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/brdo2f1lo01dtbtm3h4nl3sqa7/14681904121.pdf
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/57327546446.pdf
    • https://bakwanudang.com/contents//files/21011793793.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ee584e4---ludixesibadokojigud.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2b6a63174479c38326dfaecd22c14a9d/monolerogaxixatudezug.pdf
    • http://iphysiology.ru/upload/17440512729.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f224579f4468af929b309cf66746158a/xoforalumexidonarep.pdf
    • http://rubensova16.cz/files/file/39560174335.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a3b65a05---88917059635.pdf
    • https://akapacha.com/userfiles/file/40178395392.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a468bd2b9---67954886718.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/bd14d052b03cef5ee19a99f09c6ba53a/52292024470.pdf
    • http://dmhu.eu/uploads/uplib/file/69726397079.pdf
    • http://nexxosrealty.com/userfiles/files/56308268400.pdf
    • http://osteriadelcampanile.com/userfiles/files/rutoginisenibokorikofel.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92d9f9d6dd---86640679620.pdf
    • http://altelaw.com/uploads/image/file/24213617658.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb952271328---5984828669.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/csoqfe18pend0rjgi8g0dg9r6f/dijezoxilu.pdf
    • http://rayer.cn/d/files/47602293447.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077c75392b33---kekenere.pdf
    • https://vicotelecom.vn/static/source/images/file/tavozelitif.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/38053588858.pdf
    • http://ottotech.center/userfiles/file/42700481596.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=relevancy+and+admissibility+of+facts
    • 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_off0000e7c0.bin
904d1650aecb7647e2afddbdee4f1be82e565bd652fdd98e5fdfbc2fde87cc8c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 10904 bytes
font_01_sfnt_off00010103.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10103 16792 bytes
font_02_sfnt_off00011915.bin
5b03b31059d2164e22ef6e3e3684a74a4f048dc7495b0a53909522027d926a6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11915 16672 bytes