Malicious PDF — malware analysis report

Static analysis result for SHA-256 387dda16e821528f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 04:52:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 34a56d155e0b140f3bb1b822d60672ee SHA-1: c96132fce86dcc0f464c7f23accec08b8ac75af0 SHA-256: 387dda16e821528fdd280b37f4a9fc051a6271893b6c9bce6f4e4a990046ccad
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=biochemistry+satyanarayana+book+pdf+download PDF link annotation
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f665ec973f40c379b02752c001b3090/23550116496.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/raxexixane.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/73028789651.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/wonaximeduv.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/xidiz.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xuzomoluzajudarugerovano.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210909_653603E348AD0E6E.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/wutopuba.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/97528956363.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d6d20e5ed---jivazesalodekiwevimotatu.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/3481933348.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/15719244384.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/weguxibugukobiselul.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bavuxifadira.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4j73bj3394rus5ue6s0e619619/71282846817.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202197187454852.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/jemokabegavonivumabom.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/49936727162.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/vepinulubazabefosegivuve.pdfIn PDF document text
    • https://eetravel.net/file/jikazaxelapajiwif.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/gizopekeni.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/kozewuser.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/ziparowulegisopadajimux.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/tisak.pdfIn PDF document text
    • http://inistor.com/ufiles/files/zanowiputikekeb.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/1655546588.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_off0000b848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB848 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05F 11372 bytes
SHA-256: 17f654b7fe98256edfc60dae13930914e556d28a70452d9a68dff7ce5d9feffa
font_02_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 15628 bytes
SHA-256: 30aa045d5182c4405739dbd7bf51cf60b8c58496662521ee1a65361194f322c4

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