Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a341ae051b59dad…

MALICIOUS

PDF

72.0 KB Created: 2021-09-30 12:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3b3bae87c0f30fc7ff7e10eb93ce4568 SHA-1: 7e68125b1d99e1ef038232963470fb6b0ed88541 SHA-256: 8a341ae051b59dad605f55713b8348f3c5d684c35a8633d5d279906970ffaa93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://advantagelic.com/singhania/downloads/file/wazexudoxiva.pdf In PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dezolajozar.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0ce94f0c8---30520067106.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/12261964534.pdfIn PDF document text
    • https://patc.fr/imagesfile/netebigunujogazuk.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/76230095839.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/rusubemigeg.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/sotamaluxobarilugoguvidu.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/93381532507.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/pegutixaxawuperon.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecec4b0207---73891236831.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/80066689082.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/42348308400.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161516d6398cdc---jatufasotumamaveginopefad.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/nabururalorodilepixol.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/16084269276140397e7839b.pdfIn PDF document text
    • https://asiapharma.la/files/files/vokosetuwurugibegoniselut.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210930155632_800227624.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/velopijaj.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kijugeguxuzuf.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vuvogubudotamipeve.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/45295729280.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/16603174135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+10+software+download+apkPDF 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_off0000b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27A 10824 bytes
SHA-256: 7a5f238407a6a00fd7726fe74dce8828c828fad263a335cf35239ba129cf3f10
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 17236 bytes
SHA-256: 6e273eb64e2a9884f8c3eabc1924d0f0f9077901b9aa7886fd9c3c9031ce51cb
font_02_sfnt_off0000f842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF842 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1