Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe9c928141eddfa…

MALICIOUS

PDF

86.7 KB Created: 2021-09-14 02:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e90f2a354debed5598cda7bb099caa89 SHA-1: 07fc624d2f60c7b697112b00553a704b0c1c7e2d SHA-256: efe9c928141eddfa2faa6121da8a92f3c7ec834d2db5b7bf7397ea54d541909c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to lure users to malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://economiadecomunion.com/ckfinder/userfiles/files/81396328140.pdf In PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/34629526554.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/63904947631.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/29479054995.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d9d65389d---nameboporemowixujasimex.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/tidilorimenokojanadusir.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/32286272798.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/vojakazereruxo.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/tavagaxuvusejugomaxewagek.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613715de18d2d---92845067999.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210910173256_385078439.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/71079347135.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/70008702151.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/74400327330.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rolifodonobuli.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3c3cf80fd0f90e6ff11e40313dc5e602/doxudupafikirenebobugabuz.pdfIn PDF document text
    • https://labelmarket.eu/data/file/papobesopogeve.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f646eb2123---62070386511.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/cmh37kl77eodmmc2eqq0m49fk0/rumisebusaj.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/kidifesejoxebekoxejulelo.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/60436985541.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/jejotivalotenogimugesaxi.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=games+with+best+graphics+2020+androidPDF link annotation
    • 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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 11420 bytes
SHA-256: 2d0114dae734d6e40ff136de0d2a5a8748598ff2cb4b0d849be6cebc5d77c878
font_01_sfnt_off0001098d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 16696 bytes
SHA-256: 955169a52e7f6fad6197675cbde844e55debe607dd4adf4978848dccab627333

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