Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05939ec564fa3a6…

MALICIOUS

PDF

70.1 KB Created: 2021-10-02 09:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1b67072c70345e6b718d8d6aa07309d2 SHA-1: 57291b0d7a6783afd4bac5fc8fd1d1862e90edf3 SHA-256: b05939ec564fa3a68bdc1f5f0522e381ddef72257dc41b25ff00b20d656bf2e5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/1a70bc9bca03ac7babeebab92971ec2c/jabezo.pdf In PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dafetakesigo.pdfIn PDF document text
    • https://pcetravel.com/files/file/zisefijizemaxozosabaz.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfd8c7913b---gozeremujewokapezob.pdfIn PDF document text
    • http://emeat.ru/var/files/3069581299.pdfIn PDF document text
    • http://ore-processing.ru/d/files/bexejejig.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/27149950475.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/67046482200.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/8378847864.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109181656196275.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/81831021419.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/rigusunimalavu.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/1139788664.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/69013218935.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17d74330f---35242912816.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/2924714960.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wesesojejifimojug.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/zinanenofog.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/19452436205.pdfIn PDF document text
    • http://centre.annuaire-regional.com/ckfinder/userfiles/files/93228417662.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/f889e252b460a539b68fa8ffd22f35f3/sabizud.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b487541035aa43afa6a4d36a09b03648/karuwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=bible+verse+god%27s+mercy+new+every+morningPDF 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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 10944 bytes
SHA-256: 9d41ab5e13c122bcd4548d2e0a65946c8f9162269860db305db2fee11e316bf0
font_01_sfnt_off0000caec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 15364 bytes
SHA-256: a609f44470b1801f35077ebc9dae4e12d991a9784fef5a56c4dbc3e83ee5e7d4