Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0b1b14652d6313…

MALICIOUS

PDF

70.4 KB Created: 2021-09-07 19:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16efb1b945f1a2a28ecaf874dffb6f42 SHA-1: e1521fb16424bc81f12c0c7865ce48c23aa8323d SHA-256: fd0b1b14652d631352fe3fc716c9341bdee3f5804411b736a170bf4dbaf0e2c3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The primary attack pattern appears to be a phishing lure or a distribution point for further malware, leveraging a link farm to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=dota+2+hero+guide+pdf PDF link annotation
    • https://doluhosting.com/calisma2/files/uploads/57534086908.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/padopujatufijimisag.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/vasetawenor.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lhig0thc0a3e0v2pv22jkbt2s4/46377710661.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/25352611378.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca8bc63690---95054144393.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/pabifozosijadulodon.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/87212687177.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/74699389989.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/54050886294.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/lonugomajilomika.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a516ae424---10614842030.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/tezajonomewob.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d89151c2633edf8ed3b004dfdeff04b5/dowakonenatipadobogogu.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/6ad63f32feba95dc9e34349617ec623f/lebixav.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/e7696644e612b7b2423075cd56f2b5cd/gekinudimege.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/h2m5brfb8u2h380h31ebk80r04/77892110287.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/4378574002.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090705c6dc53---nenizofe.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/3026073665.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/61168215268.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/lokuvujubifiravizodena.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dac47e64838---rewopajarafegigojazin.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/lifomisufixut.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/98154deb20eb47ce05003d365fc70ad4/52556686275.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_off0000b65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB65C 10680 bytes
SHA-256: 8b6437a3005e2e0ee7ddd626cdfac8b979a9c62ccc5197a71a3041c1dd3bf2fa
font_01_sfnt_off0000ced0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E2 14768 bytes
SHA-256: bb02c621523d7a1c16389aca045514933025aa48796cdbd409f964b51157aee2

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