Malicious PDF — malware analysis report

Static analysis result for SHA-256 446a638539f7d69f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-17 13:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb064b3fa03872dac62b461dc8e6e1b7 SHA-1: cfbd43b75e11a418d0789928e92478b10bcc639f SHA-256: 446a638539f7d69fa7269b516d68eef81a28513020ac78a1a8cedbfe2dd06509
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://cructi.ru/uplcv?utm_term=scorpion+movie+2021 PDF link annotation
    • http://foto-klub.dk/userfiles/file/36845158235.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bepijudufarilegovifurub.pdfIn PDF document text
    • https://33mobility.net/uploads/files/83785041601.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/53364394427.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/48783767894.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141664e84dcb---27884578372.pdfIn PDF document text
    • https://costarica4d.com/contents/files/zitoso.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/tekan.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/nebeg.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/migivebajigobotimidevebo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/95732404558.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/80771549067.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8bfd9ba7c---20633629169.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55017382864.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/58360735363.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kiselotinu.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/12392255093.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a796e8686a9928318056998ca83579e9/wodokalovinezi.pdfIn PDF document text
    • https://rafautama.com/uploads/file/fezifat.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161408d4fc87f4---wufofujulanijefiwudi.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/xigototitipolagexa.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/punajabodokavoj.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021091105501573499.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ec846d34c6c2bbaced5ce7e5b124ab7c/fisarifisozur.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/ropugugumugujiwasusoren.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_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 10496 bytes
SHA-256: 44e31572a6b13d21ab5d60ca3ee7fbc7f85187cf5d9a4048dba84fe2dc401bf0
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 18916 bytes
SHA-256: 6a94e2a7212b77042821e538593f397a34ac7e8dd18fb4ef4603ee314726b3bd
font_02_sfnt_off0001357c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.