Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4a1ce76a494f32…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 04:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8d78a42f4a29b479882a6f877ba08a46 SHA-1: 659acd6f015176ae10319913a1cb88dce1121116 SHA-256: 2e4a1ce76a494f3284d1ce0e52c44278be742eabbb9bcff2dde376dbc8413545
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised CMS uploads, indicating a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and content are consistent with a link farm designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://inwebjor.ru/uplcv?utm_term=hum+aapke+hain+koun+1994+free+movie+download+720p+bluray PDF link annotation
    • http://neogmbh.de/www/sites/default/files/userfiles/file/82719105345.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/38183791133.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/patajovima.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/9085316946.pdfIn PDF document text
    • http://ombs.ru/uploads/files/33208325672.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d585bae60---40579725509.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/mibujow.pdfIn PDF document text
    • https://blogsma.com/files/mivevofo.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/679783318.pdfIn PDF document text
    • https://milkywayads.com/webroot/img/files/madegutitebumenamozi.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab1e3b6f6---65046585547.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/nevokofan.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/55240399901.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/moposadulakazi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f8a9bd2ee620fb5bc05a4f5b549d2d0a/xeridolitugutupowuwigasi.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3c6e62705---65258471288.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161412ab7ce03a---76606939890.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/powewugubuwagoxozekexasox.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/rebefunej.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace5f8d749---jedinutagabafexukoxokig.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/59448554758.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/44123895238.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/59714505288.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/34709605479.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/81625306451.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_off0000b0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D1 14236 bytes
SHA-256: ee7be9d5da65c90696cf7169d8e1bdc46097d9b4ecfc7c9b1e0ad2d3fa47204d
font_01_sfnt_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 11676 bytes
SHA-256: 2ef96b84a5ace84349560fb350746790179f7c1df5c616e306b9429e450d0f32
font_02_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1