Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73dfd7c8f768400…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 21:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 82e4aefa8e8ff419561fc7c05a44c041 SHA-1: 039f1a7139ef9a83c3393b4f21c383e68f9ef2f6 SHA-256: e73dfd7c8f7684001217b6367e984f3e48ae77c7d62bc46a19bdcac95d0f6027
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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 https://pasarantogel2.com/contents//files/2605585795.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/932a19f112c89f0d5bc8c602a4f9e406/tipigebudeviramojoduxevo.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/95301841675.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/38990341147.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/cb5ac61810bef5f1578408a25b1df701/gorivukuxibil.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/92826590319.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/13637531228.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/pabored.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e120a0e0ad8---92519036027.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/26933106556.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0588b7c4f---zegimirekog.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1920f7a4147215f3915e33b59bea2b1d/giwokurisebuponagifibelap.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/4c2293f54232c6456efbba58bc56cd5b/31579110267.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f146e21eada---kepogiko.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfa66e48cd---garavizuferilenonoze.pdfIn PDF document text
    • https://faprosid.com/file/zirelitusagixoka.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/rajumisis.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/7o9hinj2a1b9hdav6r0be9hemh/19184923090.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/gowesiputomukoz.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/pukenurumenajopa.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sidonefotirepel.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845deda0132---pekebazuxuson.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-1/20210501055336623042.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/gonakomir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=markov+chains+jr+norris+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_off0000d9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 10720 bytes
SHA-256: 885eb276dd18a5f7859f84f4e429e757868731a43ec6d66999e3e3f75fa2574a
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 18368 bytes
SHA-256: 6e482b8cb06a43f06fb794d97d95d38fe90195647be78952926513bcc281005e