Malicious PDF — malware analysis report

Static analysis result for SHA-256 757fb294056b93a4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 02:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 287d912cf699f97ed1fa3002550edf67 SHA-1: 0759765692b0e54ed027b7f723bc73aeba91d6b6 SHA-256: 757fb294056b93a43fd75eb3dd87777002c08c438d23c6a427f61a67f32e55a0
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS uploads, indicating an attempt to deliver a malicious payload. The presence of a download button lure further supports a phishing or social engineering attack vector. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 9

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=cheat+engine+latest+apk PDF link annotation
    • http://chrislahoda.ca/userfiles/file/doliguruwobofubusiwe.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5762933067.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/sujonoperutirunidem.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/40805751406.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-15/20210915191618184307.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/64551189384.pdfIn PDF document text
    • http://levotst.com/uploads/files/nutodawobidaketupo.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/79335265015.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/18027636974.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nalelikivom.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/6e8ac0290993ee9260f55905f2ffcd3e/60783548793.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/396a6fd800f221f7db9bfa1b40d2728e/19569493155.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021971421186435.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///potafimalipi.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/30744543124.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/lolaxomuviri.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/35452315696.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/feperizafipejid.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143fd83b4939---kurubirofa.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/87694300167.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/21953346218.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/kokitujupojajavisepe.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f8b88aa21cd18eb722010341bb8bc107/zazuxizunavofegugilawaxuw.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/doberenojebidi.pdfIn PDF document text
    • http://shophouse.info/images/files/25490970956.pdfIn PDF document text
    • 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_off0000de49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE49 18020 bytes
SHA-256: 39bf87aa7d68723cede1f08b022ea9125defd56acf67bf58cca8f60ea74ac0dc
font_01_sfnt_off00010c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C52 10436 bytes
SHA-256: 8bbf1d96f0640b0fbdbafadb7f6ea2683a32a26c85b6b78559d25d0b3e88bdab
font_02_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1