Malicious PDF — malware analysis report

Static analysis result for SHA-256 6586f02953bbe260…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 13:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 281513a777b9edb154c315841270b217 SHA-1: 578f8fb71192077eeafcf4d749df854411b71dc8 SHA-256: 6586f02953bbe260b596bb4dae4b0e32671b3cddfc8fdcd84adc7ff89ba0ccc5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous embedded URIs, including one pointing to a raw IP address and others hosted on compromised WordPress sites, suggest a phishing or malware distribution scheme. The document's structure as a link farm, combined with the 'utm_term' parameter in one URL, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://mishor-uvk.com/uploads/files/54886762421.pdf In PDF document text
    • https://michelbarbot.com/upload/files/vavira.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/27177068484.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc0e1807dc---4750463962.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/459a56ac62d5c9eb9e0627eb9a9c68a5/rukolijusefabeziwazavepu.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/52353800558.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/xonifobomuwuzi.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/98303313273.pdfIn PDF document text
    • http://bulmarconsult.com/files/wagifatanebaroxomerez.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/39c9d3f5745368b5a7e286dfd05baed7/87862671162.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/92575918439.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/79738797329.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/kepaxubogijetuneporudumes.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/32662196732.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/mudozolenabu.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1613a74ec6e57d---44945316307.pdfPDF link annotation
    • http://merklink.nl/site/data/ws/files/pavilubuxivoxegoro.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/somejipunejekarexoz.pdfIn PDF document text
    • http://captaincook.hu/userfiles/file/gotaruponokidimegaribilez.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/gasevijavajame.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/56499290486.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/90983044419.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/91776966918.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/94273905173.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1bdd792c94eb303505d1cfe324341b1c/wiketugunop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=android+file+transfer+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_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 10588 bytes
SHA-256: d4e3813a7dc3277c857db85b7f6c3d1c5517f5217a32fd3863910c8b7cc6c3cf
font_02_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 17480 bytes
SHA-256: 4192bef8017d7159d96f30e678b16a2c64b479b237cdfb4914b4019ae9381774

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