Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a2ae82b66674e2…

MALICIOUS

PDF

78.7 KB Created: 2021-09-09 02:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 119edd60123ce273ae6041d3c8dd8c85 SHA-1: 3067f4338a1b514b4da21b72562cc76dda6434c5 SHA-256: 08a2ae82b66674e28f2bfdfd34f41198031bd62c4caf87d851ba8f5df8a19bd8
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 websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=difference+between+osi+model+and+tcp+model PDF link annotation
    • https://gogift-it.com/userfiles/files/tesojafepovive.pdfIn PDF document text
    • http://gibisch.info/files/files/mujijagadusidovapifanabu.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/95759887398.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/rebonogigadamam.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/tibofi.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/41426948446.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db4ed200f---temebojekoxigiwivexoz.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/76493323126.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/bb69af4cd66c2579c6bf2d55a9a285e2/xisuzepazurujo.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/86698023782.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/41ea8e9c73c6875dbdba7ef08f86b87d/45277901346.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/piniribinupibeseroliva.pdfIn PDF document text
    • https://cooperspick.com/files/23586547206.pdfIn PDF document text
    • https://phuquiland.com/upload/files/45938163815.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/vaxakiwesumadulotifimifu.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1630648016.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/47411641692.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/lilozogo.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/posovogeguxewejaxozije.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/tukizoxetovopitevan.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/63635999136.pdfIn PDF document text
    • http://licausi.it/userfiles/files/matisewisumuzubom.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/benasasajuzafegilipi.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/30071172302.pdfIn PDF document text
    • http://lejonhund.com/upload/fimowesakefekuk.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_off0000d1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E3 11008 bytes
SHA-256: 69e100aef92fa0060e605f52e018a8f165e5aa65285086dd761dec00ddb12260
font_01_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 16080 bytes
SHA-256: 6fb700025391add2ad9bb993a3a1dfc89f45f4d63288f49d816f5206d1e655e0
font_02_sfnt_off000114ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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