Malicious PDF — malware analysis report

Static analysis result for SHA-256 f253e25e6502cf62…

MALICIOUS

PDF

74.7 KB Created: 2021-09-17 07:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4a9f78d54d6a9df376e31445b21f1db SHA-1: 373a0bc2f9027b26a68485801c0c39b17683eb1d SHA-256: f253e25e6502cf62e6be79c23f05ad3b251f60ec4f50d98f7c4539cdf38e49a7
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://grubstreet.ca/ckfinder/userfiles/files/11562691899.pdf In PDF document text
    • http://borik.customreal.sk/data/files/3084419307.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/000e70c4a4767361d1205931285f3a2a/givupekotulibofufi.pdfIn PDF document text
    • http://julianina.dk/upload/file/57747886563.pdfIn PDF document text
    • http://chromavials.com/d/files/joguzogasakofedotimaxoloz.pdfIn PDF document text
    • https://onlinendttraining.com/files/14509597420.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/92407355255.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/16425402749.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/artcano0jrvik33ai63gdmdfnq/tateroxedusudujanetew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ac2c3246---fifezoxoderabuzoxuz.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/7161730628.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/80066689082.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/pepitaripagefikifor.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/jafamogadaporokumifiwene.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/desibimavawazijizola.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/63941549254.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/simadetulogelevul.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/toged.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/53786610691.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/domodotubowomovasukumev.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/nojijigaz.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/96663490419.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/sofalaje.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/99223622177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+unlock+my+iphone+xrPDF 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_off0000c00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00F 10792 bytes
SHA-256: 4ec635456d50ccc8e86941a723b7ca5873719bca998809b79499ebeb716c5ece
font_01_sfnt_off0000d8c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C0 17120 bytes
SHA-256: 54f755528ef1cb7be1fc5755a3116ee0b428aab9c55ae48b7fa7ed33984ee175
font_02_sfnt_off00010516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.