Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ee0a4635656072…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 07:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 380b9303513ecd4f420d1a909560cda6 SHA-1: 78701a549e4ccb590933ee805b763a3b7ad223c2 SHA-256: 13ee0a4635656072d7b2c2539a616937c58db250a20cfea6e2c7babe4526aa03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for phishing or malware downloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=assassin%27s+creed+unity+arno%27s+chronicles+apk PDF link annotation
    • https://kindeeyudee.com/ck_files/files/83700640309.pdfIn PDF document text
    • http://happy-playground.gr/uploads/_uploads/files/zanidupitizodovozoreten.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/fisonusodigiripozewine.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/33484875873.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/pazarofejevevuwilirutal.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/74586383466.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/lenesorasawapokex.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/36811793060.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/wilizidovofo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/5e38d10db4be3665ea395f31efaa398e/60614599820.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/zametego.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/wisunudipebedusi.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/3300394787.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/75203274999.pdfIn PDF document text
    • http://salt17.com/userfiles/files/dinutiloj.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd2b2774d---gozeberowowekevun.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/23465294921.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/lesasejufawukopinevel.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161394960590ff---karakojijol.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bafb3da9f5---romokoxojigagab.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/xejaduwinafoxogi.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_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 10932 bytes
SHA-256: a229955a8bd8002627e1309c70e4a07e5b2090c22ee8a7112d1f673346644024
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 20716 bytes
SHA-256: 1991d505b75b78c790e8454e08ee529cbc7895feeff22aad6f7117ee5e3a4c67
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1