Malicious PDF — malware analysis report

Static analysis result for SHA-256 134d0380ce4e6751…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 08:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dbb5645637cd9162dbc54fe46db0bb98 SHA-1: 937fe8f3a595006cbfa611bbbfe13d9a075fe3b7 SHA-256: 134d0380ce4e6751eba108f4186b06e7d93c95ff1a787f7763771f2fcce1d2cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=no+1+cricket+game+for+android PDF link annotation
    • http://otpetye.com/images/shared/file/6137422079.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132a16a20961---27388672834.pdfIn PDF document text
    • http://vln.nl/files/file/62727441561.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/81206427665.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/84561847587.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/77422576158.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/pisufuvisekozi.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144903919c97---damopupowigula.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/73698665845.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109152034283220.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/xeboj.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d5c7b9a79a20ed1aec15c12c8b99eee7/bamego.pdfIn PDF document text
    • https://deepex.hu/hirek/files/71961833962.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/wilurugejida.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/demosanoxumeju.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/vadigigosixotoxex.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/23865203094.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/35926336809.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130bca161a54---welolojawatijoxukukiz.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/labijikenes.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/powolezoju.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161422ca2543d6---385372841.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/sebidixenofaveko.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/69009454980.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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 10724 bytes
SHA-256: 3c5587b0cdc02c57182ee2522653c58dcf0bf3e2bd11b2c392338f446dec9fab
font_01_sfnt_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16484 bytes
SHA-256: 4ad126e5189447f47f29e5fc79f9134d9e9c953c58d27f80487cccedc72c5571
font_02_sfnt_off000101d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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