Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e18abf6325547b…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 12:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f235ba87be33582241467687df59f435 SHA-1: fd9edda3649a7dd33b1229cb71d5d56d9d4ee072 SHA-256: 99e18abf6325547b7ce81587be0af9c0fe2901f8684039a01ba1ff4d4dec180e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and links to compromised WordPress uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to exploit users through these links, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=goku+super+saiyan+cell+saga PDF link annotation
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134c338440af---nipiruvisufijemiwukilida.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091010161750.pdfIn PDF document text
    • http://vpsystem.com/files/fck/xudosal.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/nixiro.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/76186068323.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/ruripupofesagelumazake.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/54580439068.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/dosofe.pdfIn PDF document text
    • http://vecsecity.info/editor_up/71632620141.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/tofalezidi.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/94227145309.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/74726182748.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/zunexogukozorirakum.pdfIn PDF document text
    • https://advik.net/userfiles/file/fopajiwofosilulela.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/susugulobolezufun.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/62245769270.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/fukegokezekanawuduzi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613462b02aa04---38134911838.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/wupol.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f2c98f02f715c5bcc3bdf1519ceded2f/mukililipegoxig.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/totoxew.pdfIn PDF document text
    • http://hkalc.com/userfiles/44650044295.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/jimot.pdfIn PDF document text
    • http://henanshuangxin.com/d/files/49681775326.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/2369712502.pdfIn PDF document text
    • 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_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 19592 bytes
SHA-256: 0ab7db8534b46321ccec36f63e682daebd3792e042f270ee6a9e4868bc061d8f
font_01_sfnt_off00012d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14525 10796 bytes
SHA-256: 08d0d0582596bd42c5ced17000ff3b747d814ef74e2e1e59b48efa0fce8909fb

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