Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeabf10591ec2c07…

MALICIOUS

PDF

89.4 KB Created: 2021-06-27 23:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26a5ea222ad8666292f7ec20fd39b99c SHA-1: fcdee28051ea381a56a357f24455ef5c22a82e8a SHA-256: aeabf10591ec2c0744a4dc3980c59644ed410fc46258b171232130e927eb30df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links and the nature of the heuristics strongly suggest the file's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/44055e64f7a76d61de5402b146cc0d2c/32861086766.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075af6c4bde9---zizafun.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/971a5a5b33ee9ac4ae41006b15cc19c0/wijuvifusamavu.pdf
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b7b3bbc4---xikebovuxikakonolajor.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a779d75647c---65173329223.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b702b6b5e4e---gusawapojonujagisuxok.pdf
    • https://minipowerpack.net/upload/files/pegawuxikem.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/56251bb64b063bbecc8c00609755daec/94124471138.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16075c46deedf8---87097591625.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/bbb3f15d466b441e682d5593fc69dc9c/35521402630.pdf
    • http://udokutscher.de/gfx/userfiles/files/44340080912.pdf
    • https://fizjolech.pl/userfiles/file/33073116391.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609417441d64e---lunodo.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/juxojapesen.pdf
    • http://clingac.es/d/files/zefotebuvimabogobu.pdf
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/1msjp2d87h5kviopiuten20g40/dalurovosonigasizazoxa.pdf
    • http://softwarefactory.nl/images/file/jalazazemurisuna.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/145fcc2e3887895b2aafa56054219330/solinadefe.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d32dcba240---kerafiz.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e6fd36c9b08f03b56633aa85bd4aa785/48306372864.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b64653d3---2843083428.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d1f93cd7---xibeles.pdf
    • https://webmenuplus.com/images/file/2682243454.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/7aiheiihnq6t92mhpjqlncasc4/vaxusimitulelof.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=running+10+miles+a+day
    • 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_off0000fb73.bin
55d241fa05e74e357ab11c2722620ca535abef857cb6519416fd360d2f6223fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 17092 bytes
font_01_sfnt_off000127e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E7 16792 bytes
font_02_sfnt_off00013ffe.bin
347a0f8c123541257ab1b03489e0160704072a2e23f1c1ce7f9edeba1072ac85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFE 10708 bytes

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