Malicious PDF — malware analysis report

Static analysis result for SHA-256 13cf3709e8fd701f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 02:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6616ddaec8b1e5d018a1c931dcfec1dd SHA-1: 7a978980b13f09d003fd222866113f00eb3d73e5 SHA-256: 13cf3709e8fd701f922e663e91a4de2a3dde733dffda2c41a11a32d1c204fed6
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for initiating malicious actions. Several heuristics indicate the PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.jakketoes.be/ckfinder/userfiles/files/rabuwunamapimiziwifo.pdf
    • http://sahcarpets.com/userfiles/file/4982036266.pdf
    • http://dhf-china.com/d/files/96045290925.pdf
    • https://garraldaarquitectura.com/garralda_userfiles/files/rarasuzevawomuzekonibajis.pdf
    • http://studio70.eu/userfiles/files/felojuliwajogifalilevewuz.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161432c36474db---41488157166.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c5de8ec048c9dc61229f28eb239e5e03/pevudimudugufalomasajezo.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/rurokowilurasusefod.pdf
    • http://artkulinaria.pl/sites/default/files/file/nakex.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e1c0e64c---wilufotefep.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/jalajesenipoxab.pdf
    • https://reaga.net/js/ckfinder/userfiles/files/komozoxutuzexarejewu.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/563b1cda47f988754da9cc3a4f2c6461/nakafon.pdf
    • http://kkc1.org/htdocs/cljr/data/files/livepobudoger.pdf
    • http://eco-building.cz/UserFiles/File/levosenuradapelutek.pdf
    • http://shesob.com/file/files/bijifinube.pdf
    • http://kalkulacka-hypo.cz/userfiles/files/50486635141.pdf
    • http://thayloilocnuoctaihanoi.net/upload/files/pusakijutojivuw.pdf
    • https://drddvichitra.com/userfiles/file/50311697948.pdf
    • http://reguitti-engineering.it/userfiles/files/bikutozopujazekisonewak.pdf
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zuwibuwefogikopexowewane.pdf
    • https://soi.icami.mx/ckfinder/userfiles/files/mezanabomuseporoj.pdf
    • http://isdoor.ru/uploads/files/21764837229.pdf
    • http://bilateralmatters.org/userfiles/file/siraxitubukusu.pdf
    • https://pnvvr.ro/userfiles/file/65918200451.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=android+pc+player
    • 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_off0000e23a.bin
e30d72a0c3ca33181ac69d07f07d5591082be0a3df84bb6c2fc93dbc66e75e58
pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 17492 bytes
font_01_sfnt_off00010f21.bin
e154b1b19fc39fc41f878333a3e37c5bb9e62947182083a16a5eda354c406743
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 10336 bytes
font_02_sfnt_off00012685.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12685 16792 bytes