Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57a313b66b446f1…

MALICIOUS

PDF

88.1 KB Created: 2021-07-08 04:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5882c4d9337a240c0c350d6c9817f669 SHA-1: ff4636a19bbce30c9b11af3bef98464d952299b0 SHA-256: b57a313b66b446f1f7055b158561093133dc045904bdbff0170c8a24dd35587c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://pixomot.ru/uplcv?utm_term=tailoring+guide+1+375
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9241a1c27---90593121243.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c36acae5803---71622548360.pdf
    • https://alakharia.com/public_html/userfiles/file/tikowojimawixemisofawoda.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/13338336853.pdf
    • https://dm288.com/slicice/file/mixuvo.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d178d30c---negesik.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8c5679ed7---mitojaxifakox.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ota7b6lghlvrd1d9g0968gbb24/girukinuvezuposapu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077d4f7b3251---bovufuzokegux.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e23b0b125f0---lorikeximamij.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed736b6132---jububeraxajidima.pdf
    • https://people11people.com/uploads/File/21390531992.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606e140ebc4cb---nexurixov.pdf
    • http://interel-rus.ru/test/sites/default/files/file/31239951324.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9018ec73---netodoxosijevem.pdf
    • http://jnnycc.org/userfiles/file/21890625476.pdf
    • https://malabarmail.com/ckfinder/userfiles/files/67246803758.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/52878163166.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e494da120d1---sijiwalomotoji.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/91a1ce1489ed7cc61ecc97e78205853b/sabebizife.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a4aec61a604b3714ffffd9862d683d68/80270221987.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5eb843eafa67d4adc74e59976ce6e5a6/punijisubojalonakilug.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608268f971549---5775834096.pdf
    • 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_off0000f664.bin
9831aecf8b30b1e2d5625f83993fe5a415d2cfa4ba95721374c3dc82bec04c12
pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 16988 bytes
font_01_sfnt_off000122f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122F5 16792 bytes
font_02_sfnt_off00013b0c.bin
42a2bb9ff4964d11b7d3d5aa51f7758daa9b2eb3f1bb75e301bc5b27aaea1f8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B0C 10628 bytes