Malicious PDF — malware analysis report

Static analysis result for SHA-256 813d84e494b2e27f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 00:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13b762e9bd053638a46f082839c73cbf SHA-1: 2c08cd4039f573846858856d183c1b40bda2d8dd SHA-256: 813d84e494b2e27fb4719f9199d5da9529ae53d26cc48fffe6861e9eb3f35f7e
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://papaicountrylodge-longstay.com/user_img/files/18224024604.pdf In PDF document text
    • https://oxfordjsr.com/userfiles/file/kujidizemavinejaxemefe.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/bezitepu.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/vugak.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f656b7008a---43012700340.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-8-14/20210814155317490431.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/a60115a7f98138ea23353e5fea514d8e/joriparodowasegutonuju.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d988757da4---ziterisanewonezafufegegof.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/8ad32f72e8f0aea96b482a47c14aff31/60777901491.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/73014879988.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210829/1715357521.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cc897a69a4e12a10629ec1f39292d1d/mexetaletemuzalakoda.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/c019303d80cce98443913d9027dd4c1d/jerutazivuviwodepi.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/lokolu.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/gewomavagubej.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/jiros.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3fea3ad31f1222ea5978106f989ee480/meligizonivetojopiza.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/32381219281.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/lafexewas.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/tojajuzirevuxurax.pdfIn PDF document text
    • https://kildevangen.dk/files/toruj.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/9aq15n3u4qjq0en7o974867kg8/jojemaxasosotano.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c989742885d---bivune.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/pawiruzom.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d17e28290---1471683914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bonjour+tristesse+francoise+sagan+pdfPDF 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_off0000bcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CC 11032 bytes
SHA-256: c755572a37d55326a9ae1cad33f212ba1263e72de4d88731c8c5ac352081352d
font_02_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 18920 bytes
SHA-256: 09393c5d190392460f9d211c4f20be5c9a361f3116a0020b27eb16b8030861ff

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