Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c553234988a0d81…

MALICIOUS

PDF

77.2 KB Created: 2021-09-17 12:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: be54444a8b6a31036bc4600f6e430468 SHA-1: ed8517299fa48f5bb48fddfec903676035e9276a SHA-256: 4c553234988a0d8181f5415a60668b6b2eaca4de24c89e79bda5e2e6c7e60d25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, with several pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for malicious redirection. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The presence of external URIs and link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://netpage.info/userfiles/file/dijejomixuduliwalixi.pdf In PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/47585478761.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0f14f2f9b32def0445bfc19a180ea52a/1180706023.pdfIn PDF document text
    • http://birdwatching.sk/media/file/98854137193.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021971049316964.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/72814553154.pdfIn PDF document text
    • http://rhondachem.com/d/files/jaliratikuzu.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/41111215817.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/50258021610.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132526e17aa5---pofevuxanodegiwevewut.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2115d034c---19716908367.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137149708fd3---dulevutadepapifuz.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/3616999487.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/mojewi.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hdddqdeev9qem4uangqhq0a4gr/50652854151.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/debid.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/31527372109.pdfIn PDF document text
    • https://khanikango.in/file/59833679781.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95c1fe984828a296cc7a013d923dcfb7/popabunasaranawamosar.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/80249934285.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/34965860922.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/82972785330.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/58089141895.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/31185775200.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/vipatutajuretazala.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/fefumipam.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/kobugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=unit+2+the+periodic+table+worksheet+answersPDF 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_off0000ca8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 11056 bytes
SHA-256: d9f1835243b26ec29a7fdddafd6e0a8dd3130e1795fe67b5a6a5169f7b043306
font_02_sfnt_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 16356 bytes
SHA-256: 4721036437e51751736e724643f0338c454f58bd5fa947d1b14016c8355ddd48

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