Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4195df013b69318…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 07:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d59f7e8e853fb9faa772a573eebcc34f SHA-1: 2624e34e10f93f871b5301a2f1767e32bd748beb SHA-256: e4195df013b69318014339364d4f3d1d6ee6435160a2acb82f0160b8552577ab
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a high number of external URIs, many pointing to compromised WordPress sites, suggesting it is part of a phishing campaign. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f46fe3234---befami.pdf In PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/29451158766.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d3b81ea8---zomopedokawop.pdfIn PDF document text
    • http://lrpharmaceutical.com/upload/files/96286173668.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613146c5a6d50---31713510003.pdfIn PDF document text
    • http://tavio.su/files/file/27729912486.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/39183671185.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161358920a68b7---69811907939.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/50214938691.pdfPDF link annotation
    • https://icbacademy.com/upload/files/59978839718.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/92247083561.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/gifis.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/23521643146.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d0467b685---luxibelim.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/jikajid.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f461554dd---bojagexixidizuven.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/duzuxodewakejuponix.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/11410872544.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/govulojokegaxemexefuji.pdfIn PDF document text
    • http://scarpatti.com/files/jewefukamobusod.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/8084450518.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/lariguxizeledita.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/xetikubo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/88861404105.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613733025aacc---gamobudijam.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/98451273895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tekken+4+free+download+apkPDF 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_off0000d4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D3 10352 bytes
SHA-256: d66a7176b4fcdd6754bea7e80dadf61ac54bf42070b992eb31bd0c942c39b828
font_01_sfnt_off0000ec6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6B 17244 bytes
SHA-256: 4225a680f77359c31985588dc221c355f8dd1ea5d12ee038ddcc0bec0b590492
font_02_sfnt_off0001191a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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