Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1487d2eabf0721…

MALICIOUS

PDF

94.3 KB Created: 2021-07-13 17:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e567b1119678f83e9e3388d988a43426 SHA-1: fa3a0d0b4d6c1d2a1a1c12a5b8f82e3dcc61143b SHA-256: 1d1487d2eabf0721a432815a53f53308b7d4d6a41bd627aaf2a2244a1b8e0fe4
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The heuristics indicate an advance-fee scam lure combined with a password-protected archive pretext, designed to trick the user into downloading a malicious payload. The ClamAV detection and ML classifier further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

Heuristics 10

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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 http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d207b6dab---43062216722.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/30715901255.pdf
    • http://ellenia3.eu/userfiles/files/poreregalawejixoxawege.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4962b0b95a---17844722949.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8a1616148---64562934742.pdf
    • http://kaizousha.com/js/upload/files/fosawisirapatufasi.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2ea8d0e7620158222448f180c5e60a18/64051435208.pdf
    • http://seamacros.com/upload/file/6482514711.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da680602a32---gurijib.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7346a7647---dufolosiwexebegulo.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c27cc89899a4e55751a47802d4e96f4f/82976001079.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bvi8s8i7jf4mejhie5377fd7fq/83637444325.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/jaqb160ovhdrl1hutn9c57d9h8/83056505828.pdf
    • http://coming-c.com/userfiles/file/2562756870.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d30ea73c06d---14075600274.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/bugmeg2tue5mle9rul2qjd3h6a/13467469738.pdf
    • http://biirbeh.mn/images/content/file/nomujelitotulumagijumojo.pdf
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/26469704060.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/f7b760c4c7beabd7a77b7e20a697639a/wevorasosed.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/roa5lm4ms066p6bkq44jqdk8fo/pokazagurapebeb.pdf
    • http://supermarketdv.ru/files/file/gidoralawix.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5af49f99c---nuturupomewenavopelipu.pdf
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/8954664560.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/s8iq19rqc9203f5ivot50h9t26/25232881671.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=monthly+capitation+payment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011057.bin
5fe13bb846a87625f2c68fd382e8dcfe6ab203fc78a8f7a761d02b6fd90f9e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x11057 10476 bytes
font_01_sfnt_off000127fd.bin
a511010abbd501503716c5e52663347b90fd6459f61225a560fd4663195446d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16892 bytes
font_02_sfnt_off000153d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 16792 bytes