Malicious PDF — malware analysis report

Static analysis result for SHA-256 094e12d94d356cb7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 22:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6bb5b70447ae1225c7cf3da2da1efa46 SHA-1: b93191d3a6fadde1253a5acc4da4d258af1e0c83 SHA-256: 094e12d94d356cb748950205c75f01e173b8b757c698fb8876c14f53887b5524
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised websites, likely serving as a lure for phishing or to redirect users to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=android+pour+les+debutants PDF link annotation
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/30361072124.pdfIn PDF document text
    • http://panova-art.com/files/file/nizumokiv.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/nidifexololofekiwitobumag.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/57048db1ede2b11893f21d900f9cce2f/raradefilejetaruto.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/26081158073.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/c0a6516557129c709c94b67672659926/pirepabofu.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/60108752773.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d585bae60---40579725509.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/1523971465.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/21944551631.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/varogif.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/42103785564.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/gatubujidisalubixezifob.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/ferasokep.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///34686756400.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/92c2d97e27bba3a3237750ca168539c6/rolalo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/16536528517.pdfIn PDF document text
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/fojufe.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vixalisejokosurug.pdfIn PDF document text
    • http://adhunikjewellers.com/ckfinder/userfiles/files/lefipowujamaf.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/a77f029299b34ceaae16227ffc77f162/49613911967.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109031030318942.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/volulet.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/rajurevolavozovokakosak.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_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 19396 bytes
SHA-256: 490d23fb1019ca4a5540492e9d070ebd576fa072af6e36f59fa6826c0fdce269
font_01_sfnt_off0001074a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F61 10608 bytes
SHA-256: 3c8dcfb7bb0479d6798495d86659aa224b98f161b5a148d4429a5b4f236cd5e1

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