Malicious PDF — malware analysis report

Static analysis result for SHA-256 045cd52d7d8384dd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 06:23:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ae7b7b941b5d67dae0c3cf03cba2fd16 SHA-1: 62f25f328b03c3a2cea7014c3f7f2481518e7c69 SHA-256: 045cd52d7d8384dd8ae06fd530d712d08c94ff66e5028ab34f7fdbf394b027f7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dalycity.com/wysiwygfiles/file/xubemurexofera.pdf In PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/xijesevilegaxewo.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/53190026129.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/xubupokanegelekaregadipu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca8a1b0159---kaduwofijagagoz.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/ueeq96h5n44aldqqsfcg8qu726/fomat.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/sezubofoxus.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/fusodofakisut.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/xibogexogo.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/sulujenajorijujoxu.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/31302342419.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/timisuzigivezamo.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/selutesurawelonivekusizu.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bdbfd1db1041cd637db0489f8aec0782/pisowasevovi.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/dogizurufosawin.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/97092555685.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/rodusekinerafefetokirefuz.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-19-33-09-45.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/pomerusolaxesofepimulugil.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/bbe68di9ufoe29gkm3kmasqba3/83018300272.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/58558796614.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/gimonanigexovozilu.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109040509184474.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/20306072589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+doodle+app+for+androidPDF 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_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 16908 bytes
SHA-256: 6a363ea5e98c2e3fadd743e0aef3e5f587382db33e503a324bd4cec2d7503a00
font_01_sfnt_off0001115b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 10200 bytes
SHA-256: 1b70db0559c1534aa5fd408481334390bc844db0de1b7638d25a743f1b3f0732

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