Malicious PDF — malware analysis report

Static analysis result for SHA-256 98314a83f3b86dff…

MALICIOUS

PDF

69.0 KB Created: 2021-10-03 11:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7743275671f763670551545932e45bf6 SHA-1: 021fa4267e6cf9410b1f1d61657dc27e6d14e405 SHA-256: 98314a83f3b86dff308a038cec7876ec75cdc32f540b3cfe77263fcf7c45cbde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://huntic.ru/uplcv?utm_term=average+rate+of+change+derivative PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161463ea30c467---ruzitofikafekasov.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/64778917415.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615645c89a9c2---92655248422.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/49169576371.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/bepit.pdfIn PDF document text
    • https://drlanda.hu/user/file/monod.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/fafapapunipevaw.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/vupoxufimifiriwiwopanemu.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/72154902936.pdfIn PDF document text
    • https://network-italia.com/file/88778654467.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/nevizebogenigub.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/16536802901.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/98640157399.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/11849272040.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/14703134538.pdfIn PDF document text
    • http://vladekoservis.ru/files/resono.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/42764606183.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16155e5ee4485e---kuribilibe.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/simigamofegulafurir.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/67493866619.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/rafiroxemawatug.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/52058446435.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16152bd64b2f8e---46622340600.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pozepabufomu.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_off0000af9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 15360 bytes
SHA-256: 28206f3090f4a0891e924ede8a6aa6f6badd852909f686c1eb53f9bd5b5de2eb
font_02_sfnt_off0000eeab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAB 10588 bytes
SHA-256: 01be28244d090e87cbfc816a282b0bd5219fdf335aa1053e96a18758cbda7ff1

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