Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb992ec12629b71c…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 10:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ccb036befc3ebdb9ebe30469a4e02eeb SHA-1: 6124d9780d67fe4e6f197f1b17bc24734b9a7a78 SHA-256: fb992ec12629b71cdcfa0e7e23aeafc1a43feccc6392d59545088532e150094d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are used as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://cructi.ru/uplcv?utm_term=descriptive+essay+about+my+best+friend+pdf PDF link annotation
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fmbsqpd0hh31gufautnn4l4im0/36127914599.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xalum.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/98717300780.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/86005328995.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e4023438f---66926533472.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/24422726775.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1lrld3236n3k317d9s7lv6vp3c/24039394582.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160761b9f89abc---20924991404.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/roponoxamuma.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/36583e2084191e58697749b9d910b05e/86074744225.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/zenilomubevif.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/89636773677.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/gemilefonilajazuzulosi.pdfIn PDF document text
    • https://educhina.mn/editor/files/5777994955.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085a27b791fc---vezovekimafewopabubute.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16075d934ab9df---96668191773.pdfIn PDF document text
    • http://dzbnf.com/upload/file///xotozotopidodasebu.pdfIn PDF document text
    • https://strechybenesov.cz/content/53315933741.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/75935088418.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828acba20a4---wimulusa.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871432f0059---fugifalukimamasaxonipo.pdfIn PDF document text
    • https://europartner2.pl/uploads/38150565367.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128b56803bc9---zixonogukabusibisixixevo.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/38224211377.pdfIn PDF document text
    • https://seerupit.dk/assens/file/taneredajafovazubu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c73a6ba09e---tenopamajubamewulaz.pdfIn PDF document text
    • 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_off0000dbd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD2 11156 bytes
SHA-256: 9ba8433a21d3d1c20a9a7f922f5880957d805470818cbf849f53f4f96ed8a993
font_01_sfnt_off0000f5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C3 17540 bytes
SHA-256: 43903e70cb1e23f4cd77c05df0dcf04f06461843b665998944bbd6a4ab639e4b
font_02_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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