Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d8bf83a19ca173…

MALICIOUS

PDF

87.4 KB Created: 2021-09-09 07:59:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8ccde4c01109534d5fa5b47a77e3d647 SHA-1: 841ad6ecd051b5fbd80bdad0ad5c66bbe19a9572 SHA-256: b5d8bf83a19ca173ded76fbf3ec57acffbd324916d27a3f1595d6db313eb71c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://www.c-l-r-p.com/admin/ckfinder/userfiles/files/purozulajinivozadopijag.pdf In PDF document text
    • https://odlingfamily.com/userfiles/file/retelebeve.pdfIn PDF document text
    • https://cardolf.ro/files/90063727051.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081703225448.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a6935f43---kelutobuzar.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/nugap.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65995786635.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/a3ok22f8d7uc57g8oguid1d366/nitifawivupilitususum.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/68544985159.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210907151140.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/72b189fdce944d89f00c81e2e7017b58.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/zawegunosiwomijulodefa.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdrhqq7hmh53dvg31rk4b3nhv5/84690047532.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/11405945615.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/46065921724.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/nitusofojojas.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/95190139352.pdfIn PDF document text
    • http://4bx.pl/public/file/21522277177.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/jotuzuloxigun.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/17868757727.pdfIn PDF document text
    • http://enricobarraco.com/files/352834198.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mexunoxogeribalikixalu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/161365fe19a7c1---lunopuvadejodeb.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/padukipukotuwonisukipu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/89397592722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=spoofer+android+apkPDF link annotation
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/27948247507.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_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FF 10344 bytes
SHA-256: eb3532c75d23f89c0f47ad6b4a11ff7f23e1f4baeab74c95daa8f663911da7db
font_02_sfnt_off00011e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E68 19212 bytes
SHA-256: e587835e3bb516a75b13a872f0a18aa3a1070a3e8b879586280567cd4958dd59

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