Malicious PDF — malware analysis report

Static analysis result for SHA-256 997f798cd6142807…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 15:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d629e39b8c471ce50966e8bdfb4a5d9d SHA-1: ec47546c30dfe7c524bf2f040b0a11f6027d606d SHA-256: 997f798cd6142807f0d843f8c30df40143d52a5ce5ab808301350b2339e7c990
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, several of which appear to be compromised CMS upload directories. These links likely serve as a lure to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://doremimarlikinsaat.com/userfiles/file/40246484119.pdf In PDF document text
    • https://bevasilicones.in/userfiles/file/35513463481.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/sasekibaxisofe.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/1920095848.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/66078510912.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/domolofuwexuvobisofigako.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2d8a24191b6b4fd41a8cccc3dc5f4c26/57742472925.pdfIn PDF document text
    • http://mailcontact.jp/uploads/files/nemilivuligu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/af05q87okrck0mv4tv1t6tsi82/tilomemovumigawepesobeso.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/banavamuzusov.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139785f42c54---zozelomegejaxab.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3a4240be3---76410794483.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/1991605296.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/44382312848.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a152495f37---14023260311.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/67580672361.pdfIn PDF document text
    • http://emiem.pl/public/upload/ckfinder/userfiles/files/17965017292.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/torope.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/jetowumi.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/5247338052.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143508948161---fisupikaruvajoxuravajoz.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/matebom.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/75756693232.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/gazugugarovatoxow.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/86221075433.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+easily+remove+temporary+tattoosPDF 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_off0000b4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A4 15832 bytes
SHA-256: 3ab26452c7d6ffd50984ba468c7e71a7ffdeec0851ec9a153ea9ca2f001c205f
font_01_sfnt_off0000dca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 10568 bytes
SHA-256: 09c7e9969e759f943f551d5685f400f3a6e95b14106d41db843367de1be3ef2b