Malicious PDF — malware analysis report

Static analysis result for SHA-256 2100f45043c91bbc…

MALICIOUS

PDF

88.5 KB Created: 2021-09-19 00:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 761f73eda81e4d4c5c94cf6953bbe736 SHA-1: d7dfc2f808a5414d89cf7fe75b00d9deab38ab2e SHA-256: 2100f45043c91bbc6601c7415dbdd41975f0dfc5d82c1703d9329f38487fd40a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely serves to download and execute a second-stage payload, while the link farm aims to distribute the malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vektor-bezpeki.com/userfiles/files/ditodamemovasute.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/mep04gao28ljj374e8ca79tr4k/pakosujuzozudase.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/49509921291.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0de2f14c96f64f5a5f81eb1f4d54fabf/76787461299.pdfIn PDF document text
    • http://volareinmongolfiera.it/userfiles/files/gixojibupubumopexiwe.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/78810780083.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f5f7d113---sivebekazipadinude.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465dcbde41c---47938009323.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/munad.pdfIn PDF document text
    • http://screen.by/images/file/91427702763.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b758f34e69---93496086832.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/67657768369.pdfIn PDF document text
    • https://vadihosting.com/calisma2/files/uploads/38591831074.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/bazitabulufagujovefejis.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/gulota.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/90899454678.pdfIn PDF document text
    • https://securitydm.com/slicice/file/69122582492.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/janibujedu.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/jagejir.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef0a1bcbdd---57724710285.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/61552945761.pdfIn PDF document text
    • http://baoveantam.info/upload/files/82656080662.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/sozewugisekux.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/84818990250.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=rom+pokemon+omega+ruby+3dsPDF 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_off0000f1ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EC 19008 bytes
SHA-256: 3015e08be712bf9b68736ee6e992107fd4ab3b91401805d86c232ed4efaf0478
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 11164 bytes
SHA-256: e88afeafc2b93fe52970168d2ed77ee69d0eb1065d7fc0317a88383550ebea02

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