Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90142bf7d7b2cf2…

MALICIOUS

PDF

90.1 KB Created: 2021-09-14 09:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c394acbf28c192e90b1ae80c2af48e8f SHA-1: 9a4914c9196e9fa4c73d13caa091a9c0f94ce836 SHA-256: d90142bf7d7b2cf230310ad2a6603aba6c242f811435be87f11ad27b72926bfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, including one hosted on a compromised WordPress site, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://seeandhearbetter.ie/img/shop/contents/93438589474.pdf In PDF document text
    • http://stillincontact.com/images/mails/file/wevumoro.pdfIn PDF document text
    • https://onecre.com/images/content/files/leverobepu.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/gekufimivatu.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/88137514442.pdfIn PDF document text
    • http://wieswioska.pl/userfiles/file/tufakedokudatimo.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/kumizopixuma.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/gobupabejeliropozijuteta.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/33142392823.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/pomefenanuda.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210902_224852.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/kapiduwon.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/9954660882.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/99833554565.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/jumekoguxiwuv.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/71511d39422deb5c6716bcc798bd1fcb/gokevigiza.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/057f240d0e91304e977d50146f3152dc/kukojeni.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/16521185934.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/54713887278.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/8k3j126opk4pld194fmq4ao4un/29870340660.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/saxezokebupubavutomuba.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/70860194707.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/nilavuxaxogumurodisuzopag.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/bereb.pdfIn PDF document text
    • http://esistore.com/userfiles/file/92715315186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wheel+of+fortune+before+and+afterPDF 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_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 10424 bytes
SHA-256: 0ac9c57b859bfb6da9f01b7a52c934176230c155a2078a940253ae4bf2d6cf7a
font_01_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 19064 bytes
SHA-256: 8170c9d162bd2de834b86a14aeec49d957b351e8c3b448096504291cf84b1cf0
font_02_sfnt_off00014247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14247 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1