Malicious PDF — malware analysis report

Static analysis result for SHA-256 4269eee819a2a58b…

MALICIOUS

PDF

87.8 KB Created: 2021-09-21 01:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31afb783dc782d42416f7327703f37bc SHA-1: 77dabe5e240ccfbe252bb4953248272cf76c488c SHA-256: 4269eee819a2a58bb76619e6a53599be7fea0a2075502168bf8bf8c648152b94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://nomylo.ru/uplcv?utm_term=android+getapplicationcontext+example
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/69915606295.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/67107948583.pdf
    • http://candleelectricals.com/uploaded_files/userfiles/files/76867060282.pdf
    • http://cleangroupbd.com/ck/upload/files/39777145857.pdf
    • https://menu2uplus.com/images/file/linasunemumaguzusotutuv.pdf
    • http://idolyokocho.com/js/ckfinder/userfiles/files/56539331802.pdf
    • http://nuovartea.eu/userfiles/files/43387296219.pdf
    • http://yuhao-tech.com/userfiles/file/13760041157.pdf
    • http://nhagiatxanh.com/public/default/ckeditor/files/20651831336.pdf
    • https://www.wemservice.com/ckfinder/userfiles/files/72445575449.pdf
    • http://satisfytech.com/ck/upload/files/vizowega.pdf
    • http://srmtteaparty.com/uploads/files/202109130624493033.pdf
    • https://erdenetpost.mn/userfiles/files/dubifogiselozukejekas.pdf
    • https://dalycity.com/wysiwygfiles/file/99953698858.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/32879912060.pdf
    • https://vinadesigndanang.vn/uploads/image/files/35705712950.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/nojaletejisiviwejok.pdf
    • http://app0.linkeo.it/ckfinder/userfiles/files/pesoramisinolitasisaditez.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/traiotu5hf4j4pr37f9h3njp7q/sonoxeluxuregew.pdf
    • http://giaydantuongphongngudep.com/images/news/file/betenubog.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d6d3729537fb0d8b8670b68f5f1d5b6/43793605253.pdf
    • http://wonikqnc.com/upload/editor/file/1632052181.pdf
    • http://foxadv.net/file/noxifagawenotofomadapu.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/janala.pdf
    • http://elcampoeco.org/FCKeditor/file/gudotijajuworavozu.pdf
    • http://www.recko.ru/ckfinder/userfiles/files/bemarane.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148b44d9a8ac---90773785566.pdf
    • http://gz-chengeng.com/uploadfile/files/91514306280.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f385.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 16792 bytes
font_01_sfnt_off00010b9c.bin
dc883013ee7632cac922d086a4821f88432d761f419451aab13d895d2ed85739
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 10772 bytes
font_02_sfnt_off0001242b.bin
aec34c2cd0c01013163659af1920f689b5776c012bba678a1173777e4904d499
pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 17504 bytes