Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ae7de79d269b93…

MALICIOUS

PDF

85.5 KB Created: 2021-06-25 23:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98c3cc2afb5171b02c4aa9d0a2e0a349 SHA-1: ed6c466cb7f59a2555ee997f285e8377eb87b2aa SHA-256: 65ae7de79d269b9318a151116e7d5ef1cfd8ab14af6c0cc8bf806ca184d7201a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/27e73b820bafb6b72a1b9cf46ca57eed/lapatojadowanojaleme.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/eom6te6te42d4qji3u4veo7g42/4949420080.pdf
    • http://artospace.com/pics/file/68220480462.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ada91cf77---7174718245.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070a907691f9---bupetonikivukobifivajekuj.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c25398b3---vuvoraxiwowoluduzasezekav.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5bab8a387---lubunerap.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/busolurosojagulisowiv.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/10c0c1bc32c47f20daecea7ab55dea25/nemabitipabelinugeja.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/27426506992.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/mdo1qkukckdkqp0r4v31si46rh/bikopididew.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/coihtmaeb9m7n2adhhqv8mqgbd/97989502589.pdf
    • http://rocb-ap.org/file_media/file_image/file/92558570445.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/79824632776.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16084f7c187b2b---10107760630.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096dc1b35140---wewovitureduzomoniligubaf.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c93d9e5088d---93915701412.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/lefalalujunemebarimidi.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a8fe15502---51138509683.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d31b7d904ad38a37e197660da0e95c48/1465800598.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/4fe1a1d77b5dab19bb86b35c423b6616/17230587800.pdf
    • https://service-panev.com/userfiles/34686178610.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=new+terra+the+expanse
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eca2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 16792 bytes
font_01_sfnt_off000104b9.bin
9be7291b8098b3ec5f8ec1b8208a75154a1e221316fa84234d84478ff04bccad
pdf-font-stream PDF embedded font (sfnt) at offset 0x104B9 10256 bytes
font_02_sfnt_off00011bcb.bin
0e4f1d50fedfbe2ddf784581c9d4aeda7d3c111dd72924c599a799eed91b3eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCB 17236 bytes