Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64f116da5ea226b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 19:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d874b14036097c5869f7c88d0a78ec9 SHA-1: dc8726a8b86f6b56100e602e5d8058ea19ed9317 SHA-256: a64f116da5ea226bbcb15b4a4d013284d583e0a232151f154bc7ea6ddb71f2ea
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to initiate malicious actions or redirect users. The heuristics indicate the presence of a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to disguise the ultimate destination of the malicious links. The ClamAV detection and ML classifier further support the malicious nature of this file, likely used as a phishing or redirection lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ro3j5ufec03ta3qgbpmqtpe9hl/68978187780.pdf In PDF document text
    • http://grawerlik.pl/userfiles/file/72471498730.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sevotuxovafaxumukujaras.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4guf38dh25f75fef2vmvtrod8q/32577728755.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/rakilotozorufuzubik.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/3fd0548065cf6a29a5cfc23fc7414f0e/doxisumolurobuzodoloz.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/bikal.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/xusivujebeja.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/36883548440.pdfIn PDF document text
    • https://network-italia.com/file/gutos.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad1ea4359f---44473117889.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d47d2d5d---dujibopomimu.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/60880851527.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/fasixeko.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/55471410359.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ookml6jm8oilh69c2s0c7gaek/fiveli.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/vemilorupikaveve.pdfIn PDF document text
    • http://rentaruedas.com/files/others/tusupu.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/84314756530.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/kipudorumef.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/mebilelekewog.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/pudex.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/add6426fd50f6920bc21740989a26f43/22934581117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=management+of+midline+diastema+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_off0000ddd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 17720 bytes
SHA-256: 0e1bcb66fb43ee71ac54af8ac836b7c0d4a550bb4aec996a5b92668e869e3132
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 10736 bytes
SHA-256: 91ab326c66ea13f1ed799f54de3b2df2461ed48a154379055176d6c0d70c607f

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