Malicious PDF — malware analysis report

Static analysis result for SHA-256 4562d779ffaddc21…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 21:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56420c6a02b35db3fb3925021999bd67 SHA-1: 0c66ef2cd2e008b418d394eb437c119e6dab3806 SHA-256: 4562d779ffaddc21c96cc22a620ad828ab502e6a74859a77e8df6fe7b0bebfc4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ClamAV detection and ML classifier further confirm its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pixomot.ru/uplcv?utm_term=undang+undang+no+13+tahun+2013+tentang+ketenagakerjaan+pdf PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/nh1bd6u47i024ev149sff14165/nefuzaposonepa.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/pududadufotaxisusabolat.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xosexidigemopigoje.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210819153606.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/benanakovulusenutekofoxof.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160789f0a00a3b---77037417345.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/17915544372.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/juxifurejawojuribuw.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/pukalita.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/6926663154.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/daxinamejuzom.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/1243517233.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608873020e02f---30483063221.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/fefigabonelubalubakovikot.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/pimuvozavuxalanexerir.pdfIn PDF document text
    • https://istanajp.com/contents/files/dorafilaramuwonesid.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/24424903090.pdfIn PDF document text
    • http://sehs67.com/clients/e/e0/e078d4d0076166a7bb489ca3b3a583ab/File/zulapajidiribubop.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/75254433986.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/752300b400c57ac22c4fb4298087c97d/64966636170.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/57853757294.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/bolunifoletizuzorotomof.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609820a233a11---tipegarutufezipi.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e679bbbfea9---mojodumegiruporel.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_off0000e150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE150 11264 bytes
SHA-256: 9ed838c9fd355cfafff48d87e6bce985587ccafc59662dc79bdab51852b933e7
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 16168 bytes
SHA-256: e74a2e48c4cf68ec70fb525344621106892e8e8affcf8719f2196c10fc2faa10
font_02_sfnt_off0001253a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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