Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1a353847888d2…

MALICIOUS

PDF

94.4 KB Created: 2021-09-19 11:34:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71cc3d6804f37590ef4618506227421b SHA-1: 9b0ef46d23742e9607fb43232bab401b38dabd00 SHA-256: a4c1a353847888d248ca778af7a1528f98aa05e7e252f7734fd1c5dd8d625721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed to redirect users, and ClamAV detection confirms its malicious nature, specifically flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=antutu+benchmark+poco+m2 PDF link annotation
    • https://jahanchart.ir/data/files/file/piwotuxo.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/rijotakuwe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351f286f9f7---zurusakezezabus.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210901121240960257070.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/monarenobederikiwaza.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/71136327829.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/64264491511.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/rugowu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/pevarimisus.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/6033374036.pdfIn PDF document text
    • https://mimpishio.com/contents/files/44952022934.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/bezupilavejug.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109030602323455.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/jadanifixirejis.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/87726811763.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/83513395418.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/59538891690.pdfIn PDF document text
    • http://otpetye.com/images/shared/file/kuxadapome.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/c8b757thcmi8i4ml69na22h173/piferexetenoke.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/wapesoxidonesiwajit.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/56k2icsgkltrgikjv6foo6l592/31071536387.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/49928922786.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/nojevowumajoworugisug.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///neminajo.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_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE8 20728 bytes
SHA-256: fccd2e0ef22b3a7aebfbd2c78f676b8428c86da870d2fb1d812408b2c4f5bfc3
font_02_sfnt_off000153b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B4 10764 bytes
SHA-256: c6de833f854b20675c3ea1ff144fdd8737bb5169cc2d3a48be1c6f98bcabcd39

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