Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ef463c9b7a2fb6…

MALICIOUS

PDF

77.4 KB Created: 2021-09-04 07:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 217e2f0ecb1b8f34ac6fc0f8c247fe89 SHA-1: cac74647728b4b5cf21aeac411bb05afa7584962 SHA-256: c9ef463c9b7a2fb6ae9d412b817401a90f3ba3d354b41e04a60506871fe57934
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this PDF is likely part of a phishing campaign or a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://infrive.ru/uplcv?utm_term=mutation+form+pdf PDF link annotation
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/aqrsjaacddo83ij3778jfnvoc0/befojuv.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/edfc72b08fb2b9c84c208546d92a694a/polobewinezije.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/tigomuxupagekitana.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/4c9a2ed2510478f7b79533829320c078/furusukotaladakitovuz.pdfIn PDF document text
    • http://someteme.com/archivos/_20210710045506.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f2309e76---15925570469.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/79751667263.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9aa690e641---fakug.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/riraxoziz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46ad2cfd3---risirujisewowerof.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32627bb97---5622079147.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/xegatasexa.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/96htcv3l81nminkfk9qfjc9bg2/vaduj.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160779b95b3339---bofozexagobeto.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8bda31ac0---vusototumajusazo.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/64060690897.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0jp5nc3k2pkhd97qjtmqg8hlq/84146779186.pdfIn PDF document text
    • https://proia.bg/userfiles/file/18465959451.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32835000648.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/pagejokowofiraganedi.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/26480889339.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/sunovinuwuze.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/29462518192.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/eaca6526008eced89ad78bdecc2d644a/96502324923.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/rekevegevesukot.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_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 17524 bytes
SHA-256: d26877cbfefbd34638015e3cd5f71aebabbf56425f4daf6656611b7622e459d5
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 10408 bytes
SHA-256: dd8bbf1291ed404d3ed953ef0c6ded20be87f3c4a06651edaad9803c716eac55
font_02_sfnt_off00011066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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