Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d55b2d207bbd632…

MALICIOUS

PDF

94.6 KB Created: 2021-07-25 09:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b3ce42b2768193899c2dfe42dfec3f66 SHA-1: 862fe1f69cfe9643e8a0b48a3c47bfca003f8620 SHA-256: 3d55b2d207bbd63255fec67b63ab1ffbf59166bf60b928687c86c3f40e0cd02c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/32f6afebe83ba5179220bdfdc25e6486/seruw.pdf In PDF document text
    • http://daiichibus.vn/uploads/news_file/80141729138.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722e0c45fcb---38215999072.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/xividalujidusukola.pdfIn PDF document text
    • http://webbuilders.com/files/file/ludikibotulutedagake.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/mafuzekedotipenil.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/kelebojigowub.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f28d3940f---65103180923.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/girovabekanubokoxoxomavof.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/30585e4a1066f2a12100563390dd4ff3/kabusozu.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/gaxomekorupetulit.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/napad.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/3100578088.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/wakamogudopotufosiwagoji.pdfIn PDF document text
    • http://emmanuelmissionarybaptist.com/clients/74938/File/jekiwomujubugotafoseguzad.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25824b9738---nosinamo.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/9160642af6ff8bf2d83f91022be10e3b/kigopoba.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/c83f531f0e2ff30d36a569de086372b5/daweja.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/19198808989.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62150b20d---dodisefifuviviloxonopifu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829772dd2e9---boziwowezafuxesufin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+turn+aux+on+pioneer+mosfet+50wx4PDF 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_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 17820 bytes
SHA-256: d61713aa9346e0b2626c49a288fd40668dd3c26fd7c2df315653799783b39012
font_01_sfnt_off00013897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13897 11088 bytes
SHA-256: d8c6f035ed14addc9ab13f0b6b306821138b7aa32d32d37fe2cea0ffa97ed36f
font_02_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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