Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f404d56d33152e5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-01 01:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a83558979861909f34a3705e97242dc SHA-1: 1b929b39183bfd40f47a7ddeddd8bb0855282b8e SHA-256: 3f404d56d33152e5d9f8aafd4791274a9dba0fc6cb35b5f2c070cef5d122f6e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting domains, likely to distribute further malicious content or phish users. The presence of a 'download' button heuristic further supports a malicious intent to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16109a3e28b7c7---mosurexilijifanokewimik.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160becd7e7f9c2---41353488190.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/92411264213.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079144285e69---73771804743.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/4001a9e72a4de19d753ffea0de115a7e/7639492329.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/jivexunen.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c93cb6dd06f---guxugodofasajozujixuxib.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/81543766490.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160f43ed088185---35843408278.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/9hekb9l9csashk5b3od8e94nku/nokibuwuxulubumew.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/sk2ic1bd7ueccteafnudofkcvq/wizuvabevawuxipomatexefu.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/gabamo.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/savedika.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f76662364---6291535771.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/tifatilusov.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/70887397253.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/9a8f332b874a66887836a76a393aa488/59192578780.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1624469181887772272.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/641049143.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/3lmtf8t3f312p1v26vjqqool21/87169694620.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099dae58b861---pozomekoru.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180417011311.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/0d148cddbff57f5e807a36d11083f623/vuxado.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb46c8647---12540772778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=10th+book+of+moses+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_off0000c409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC409 10568 bytes
SHA-256: 341adc11bc8720d682487223a165ea29977da1cf192e5e091c5c62dbbc5cb8c4
font_01_sfnt_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 16896 bytes
SHA-256: bb5069a4928f56ee962d4bda8ba3a0d032b993e1d77de9c497aa07df54719da6
font_02_sfnt_off00010760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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