Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efa0f5399521efa…

MALICIOUS

PDF

93.5 KB Created: 2021-08-05 02:03:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a060a1b989503eedce42bc3fa966fae SHA-1: 9d616d1c2c01a8a0cd8c6ab9a1c0d55145ad7613 SHA-256: 4efa0f5399521efaa0340e320770bd72460f42852521367cfa61d8ecd6396d18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://caramelitos.sk/files/93964717031.pdf In PDF document text
    • http://cec-intl.ru/app/webroot/files/file/68290403445.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608402738d9da---89585232547.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083621eee33c---43516931599.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/damimemozetuxexi.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/67030550471.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/natarubinemusir.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/bokusisufazagigapituzap.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/ligesigerezux.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fec19fc3519705ad12fabd859eb18abc/lezegokifarajanivaduro.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/muguvurepuxoserukoziwiva.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712e146f7e---talopen.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/gisuledafifobunemef.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/27803660163.pdfIn PDF document text
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/nixafetenutaveworakavuzek.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/38320124512.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/turobisasixe.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/80939880012.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80752613b---jerixesebewawobulo.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7be2f0b3---33575595286.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/lapifisilusepuwudurijuk.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/kiporutebamirofuwidedadid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=borderlands+2+bore+bossesPDF link annotation
    • 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_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 17244 bytes
SHA-256: 9da7e9ec00277f0bdb2bfef9d0fce8acf5fc8ccce6b2871abea3783b9c6c3cfe
font_01_sfnt_off00013864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13864 10364 bytes
SHA-256: 68c72db5f1f18dbf9ea151057fd95c03ccecf419e254db7f36aeba4d5e8784da
font_02_sfnt_off00014ff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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