Malicious PDF — malware analysis report

Static analysis result for SHA-256 524f5d6671480f72…

MALICIOUS

PDF

68.4 KB Created: 2021-10-04 04:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6ff2ac97cd9d31bb256df2f022f4e3c4 SHA-1: cfb484cec554406d3f48ca3de1cb1c3ffafbe827 SHA-256: 524f5d6671480f720fe5592d7e8fd980e5b6ed8010d66c989a041537139147a0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. 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 0.9956

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://nomylo.ru/uplcv?utm_term=cost+to+fix+brake+line PDF link annotation
    • http://aimecostruzioni.it/userfiles/files/mumen.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/84959520743.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/29322524268.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/boketadugur.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/kavinefumu.pdfIn PDF document text
    • http://parateam.cz/file/wedutixigik.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/suxez.pdfIn PDF document text
    • http://briquettemachinery.com/d/files/fikapumaruluduliwaza.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/xazididolunatuderel.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/88808394831.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/98526132323.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vk3mrk218e63kj9oqqitp1c02l/85227021562.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210913030928396566.pdfIn PDF document text
    • http://bebaldebaran.eu/userfiles/files/38955810155.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/zowalimometimudolo.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/89587712946.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/bewaxemutemujixufajekis.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1614709a406329---rufenawoneziwot.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/wupabu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ntqjqgtciu44ova5c3ud81rb23/gelebebeserek.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/ziwesozafonibimo.pdfIn PDF document text
    • http://boxethai38.com/upload/file/wonubofujararima.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/vinekunosategazexubebi.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_off0000ae7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 10572 bytes
SHA-256: 930738aa8060669c9f304a5ef9acc5a083ab40997044dc15d21b7ebf52dd4af7
font_02_sfnt_off0000dee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE4 14964 bytes
SHA-256: 22635753d5da6539609ce609cecfef6705c7de39e9e589342096e5961b05ee60

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