Malicious PDF — malware analysis report

Static analysis result for SHA-256 19bbb0ace8ff1cd6…

MALICIOUS

PDF

90.2 KB Created: 2021-06-15 12:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ec39dcd33ee5f37502b5db18e6717c7 SHA-1: 59d9860571814b4a051f56015f7aa2052d13a7c4 SHA-256: 19bbb0ace8ff1cd60d4ac3c038ede9770597aa2f66cdb55b818e9dcfb4b0fab8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was flagged as malicious by an ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of a 'download button' lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://chcial.ru/uplcv?utm_term=12th+bio+zoology+book+tamil+medium
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4b7c795f8f39e788115b1d3bb0a490c1/38005357023.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/d07582c83124a7fb72cc1a33fba5451b/29672118978.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/vjn50l781l14od622h14ukejs4/68675247554.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/64dddc387eca2a77f6dd4585ee33f891/53183025803.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c921bc37a---bisivapitivexelit.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bba8598a3d---20976955830.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4e4ad9b0c---sugixeseribe.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/86d8f2eb7e66b563b83441fedc3028dd/96315702315.pdf
    • http://asfus.net/virgsurv/userfiles/file/jalukigiwufen.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c544abe528f---31890889157.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160762e073d4c1---90415501414.pdf
    • http://afghansolar.com/userfiles/file/vukuvalalivop.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc0055c6ba---91504105739.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75cc9556e---97313964719.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0bb1d8661---57437505313.pdf
    • http://www.sport-konyv.hu/userfiles/file/97239760541.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d8283ec9a---70888369836.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000fad7.bin
e089b356fb4f9022291e44a432a28a32de77095c18943bcd5e03c8e1c4f7d021		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAD7 15540 bytes
font_00_sfnt_off0000e886.bin
75918f4b4d97ab33963aae540f2b7db443c6376dc9d51387e970787f51ecbcde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 5408 bytes
font_02_sfnt_off00011f5a.bin
a3e95a366b7bf4066236a8359fad0814ab2f4c6b05af33ecc7d11f092106d4c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5A 11024 bytes
font_03_sfnt_off0001452e.bin
73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1452E 16204 bytes

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