Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a763041af7acc3f…

MALICIOUS

PDF

64.0 KB Created: 2021-09-07 03:13:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c936a89c068fa527f02d4fb0ac4a70d SHA-1: 064f2bd4be60e954374ed7fccc61db85a02fd8b1 SHA-256: 5a763041af7acc3fd85e8010bb616375eaae0e73b1adef2d12e4e630e65a3ee8
162 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 link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7361

Heuristics 6

  • 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
  • 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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/28215ae2c37be9226ec42b7593cf076c/vabag.pdf In PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160859ed5e0aea---49898866961.pdfIn PDF document text
    • https://brianspradlin.com/userfiles/file/58915770610.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/0af7fec9734f22e87c97a8fd0a981871/sogemovegas.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf0f6aa86e---kilitirukemebo.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/10147945986.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/89552027723.pdfIn PDF document text
    • http://satbietthu.com/luutru/files/poferifefe.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/5741e2bb6fc836d9330cdc57d24b6dec/muwikeganojat.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/27792b4b0b30e7be1e562a905e1958cf/zugevidekojutarerarop.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/zofizunumemafuxofodotoja.pdfIn PDF document text
    • http://e-sportis.com/images/upload/zaveliwopudim.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/991onrsl3m8fqsk8m6n9uq7lnv/toxakamorajuvevapulupem.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xevedunevepekefabed.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/nelor.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c9842c798---webeximoxof.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/58032124555.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/23931441065.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/b78b2a328abf5ea7ac73a1d755af7b90/rujotosikidujuvovamuwi.pdfIn PDF document text
    • http://musik-fachberatung-neumarkt.de/images/uploadedimages/file/91680074029.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/41738798890.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/57937776497.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zabejediwizegaxivexiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=reliability+engineering+handbook+volume+2+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 11452 bytes
SHA-256: 6efc29410362a3c61b3d43c3c837b51bcb4c99bc0abf9fa9b07a61891cc218c7
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 17668 bytes
SHA-256: 04f5ffcb8bd4461c1708590b4042d636f3c958411d1ac6e0989dd7c822e0a22c