Malicious PDF — malware analysis report

Static analysis result for SHA-256 815ab0ad2ee3d136…

MALICIOUS

PDF

71.4 KB Created: 2021-09-26 19:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 072d4104f6663266fd870ce8f090ff28 SHA-1: 8efead4f9421755b246a3681b021ce8f1b576ece SHA-256: 815ab0ad2ee3d136aedd6bb1b3781f4ab2f04f7179fa6a0703a6231c109ba76f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the PDF structure suggest an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://wxdyzs.com/userfiles/files/54343473299.pdf In PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/47365848501.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/sirogidazofitiwijo.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/56231197093.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/14052115795.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/39282255609.pdfIn PDF document text
    • http://polipack.ru/content/file/3528074118.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/39121543978.pdfIn PDF document text
    • http://cbstav.cz/file/tonoxubuponetakulifu.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/xunewamonolale.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/latanogagakezujetukeze.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/woromitosirukaferomokof.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/papexod.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/nuleladixamug.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ad2dac06---3138008725.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c771f1fa00---borulobux.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/38598068839.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee133b900e4386e0e978b46a33583812/66223552830.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/lodugepitalimabujo.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/98191359628.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161347366cb311---lilolopidigudironup.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/32988280000.pdfIn PDF document text
    • https://casaalu.com/luutru/files/10423018669.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/22194394435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=you+tube+broadcast+yourselfPDF 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_off0000b445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB445 16784 bytes
SHA-256: 3df943b8b7a41fc0b7eae6c89f62919c5aa7da9879788f84b01e4c954d5caec5
font_01_sfnt_off0000df7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF7F 10612 bytes
SHA-256: 7848e333bb23797acc31a7667f9aa6755b7205ad04e05fe3dd1465473aac2d74
font_02_sfnt_off0000f7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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