Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5be41a3be3bb5b1…

MALICIOUS

PDF

70.3 KB Created: 2021-09-06 03:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1603111b35938c64c50281dbeef7c275 SHA-1: 842d622dfb0681732a7ab2c708e6fb42dab8e139 SHA-256: f5be41a3be3bb5b1851f012d7f590320197d4a46d43e9423293e47db92f4c341
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, contains embedded JavaScript and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c0487ff4---galelinole.pdf In PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/kowaxepekumupojuwo.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/tiditotobofelitezesu.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/u56idkr5dip6e5jkkbbrors78p/75457101731.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/31564735999.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/dimerelefijurutevapile.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/paruvenaxutewoki.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/58634325213.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b1db1ab7---42190237174.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/61703346020.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/vufoturutuperikozuwane.pdfIn PDF document text
    • http://hongdacable.com/d/files/biwebofegokomurof.pdfIn PDF document text
    • https://jurad.eu/files/file/mupijojamezuxifesu.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b3d4838cf1c93a3b41146736e6198934/jedofometosot.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jawewobuxegojer.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/kipipetetaxabado.pdfIn PDF document text
    • http://3asoft.vn/img/files/kewigupoxago.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/54179526916.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/vekoripi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df5a6d21d1f---tedoreluzefesitit.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d9640a---jagefirexupu.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d67e2ef620eda3e0b99b72fce6fd4421/21617872394.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/fipit.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/nujipemisev.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/15689741763.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c7359031054---95321287270.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3a455468---bosub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=erp+implementation+guide+pdfPDF 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_off0000b74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF61 14276 bytes
SHA-256: 387d2baaf7f36badfefaf36cf80a75465c779a7c007282f98bdfeb07a70f8980
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10756 bytes
SHA-256: 975c9519e1059b7192c8c58692b6776bd9b5ef3221f13dd11977b3f34a3dfe5c