Malicious PDF — malware analysis report

Static analysis result for SHA-256 81186c3123dafa87…

MALICIOUS

PDF

105.2 KB Created: 2021-07-18 17:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4cedab4feb1cb0fdb6bc7ffb87ff73ff SHA-1: 6c3c26c31155637084add28722f05cf4b3952587 SHA-256: 81186c3123dafa879bf41d6ec60f5816c86a39e480569fd083425d15a0c61d4a
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous domains, many of which are associated with compromised WordPress uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9687

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 http://digjamaica.com/app/webroot/files/51938879963.pdf In PDF document text
    • https://aquafilling.com/userfiles/file/voxix.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/biribowumuw.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/898565a3f5b2d1938e2ed508bf9b105f/waxijat.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/dazifos.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/b9gl3uk0mvf9sn4qoodugjpii0/37586860818.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/jazesedisolalugakidemes.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160772186d4ad2---beziwovawinivavakekuzegu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/6967635046.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/94863266667.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/gajixifovatedam.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/1b57315f93cad83dba333cf9d8eda218/4581971842.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609255cd015c4---94396673803.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/simaperewa.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a083dc5451---77769896510.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bced3f6a596---3773281247.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/1226934889.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/509caed5efe2cba982dc157a51050aa2/57255880340.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/65390729131.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/36819866416.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba88887a0fa---48772804332.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/39193599717.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/60518739f8599bed4544774a6c04f40b/nesarubo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfcf76ce31---vakufalagonisatago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=chortle+meaning+in+englishPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00014bc8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14BC8 19448 bytes
SHA-256: 938304bd091bff6d25fc64d01b7b159023a7efc1ee520413f78777f3af2c5b04
font_00_sfnt_off0000f261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF261 27076 bytes
SHA-256: 52d1dd503a601566be9c105e6fc80b9d084bd9c71d800070bac958f0a441b67b
font_01_sfnt_off000133b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C84 10584 bytes
SHA-256: 9726666d449fe9c4910f5817be23258e7ac0d5b7b394ff28fd10c3f48a5cee6a
font_04_sfnt_off0001847b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1847B 4484 bytes
SHA-256: fe782d9a02c9a0ab574456982af4816b81ec9b2edf80c07bdd0e27aab892f318

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