Malicious PDF — malware analysis report

Static analysis result for SHA-256 719e9ea7ab3c447d…

MALICIOUS

PDF

245.7 KB Created: 2021-07-02 03:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f96e91fddccca0c1ef3670b47026385 SHA-1: ef53cb6f92a6629c71a3eb4e868cf700b201c647 SHA-256: 719e9ea7ab3c447dae5df6679c32c3981855ed091aead9b1a8d51893ab7156b1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a phishing lure, including a link farm and an SEO redirector. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to compromised CMS upload storage, likely serving as a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://chcial.ru/uplcv?utm_term=empires+and+puzzles+discord PDF link annotation
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa70ba0c30---67645246861.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/xoxabavonitokapun.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/b336707a891ad3398b8015440e2bbd54/12684112722.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/715379842.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/97061646165.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5eda8d6272ce2841e9f4a7fd0f40565e/50398785300.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/famivogaz.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d6996ff90---minetomijale.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df44bc2a54---86464200250.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b2576139---17985797438.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/oai8a80jitg79rgr2vtvn1d2nm/24534986432.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8139651c53a0ac095a17238288859648/luladafewekaxisuzi.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/60554360369.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/eb857b9390db84670a0e80afbc86b0b4/toseligegonin.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f83cc890---sawuziziwaberojoro.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfdb0202e9---tixemixeruvelu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8659c34ad7---zekujanu.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/vutoji.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/27fee7bea6baea1563e3ae002bb74f3f/30487933369.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3403055a7592fc066dc627a306f95d25/xolinelisuligetemojag.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/98kc16strbg39pabbs3locg052/77904039822.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/d80b4fdbe86fee89496e5d21c27ff923/baramijorefexugugiloteji.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd0b156c68---lepojowizikeb.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_off000352b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x352B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00036ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36AC6 27900 bytes
SHA-256: 4dbe6b939c51032d587ca5e0d09d394ebf36a850a7060b24941d3d57f3435aab
font_02_sfnt_off0003afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3AFEC 10720 bytes
SHA-256: 313ad6be787da2a8d0f2941a45d36c9f6f94c12fd773eee2abab3cd323bf5900