Malicious PDF — malware analysis report

Static analysis result for SHA-256 8975de86cd37da34…

MALICIOUS

PDF

83.8 KB Created: 2021-08-26 02:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e015cbe48088aa28cb52741de11bc934 SHA-1: 916346bec467dadb0ec0d2ef6b9e4e150c016cc8 SHA-256: 8975de86cd37da34b12eab62ffdb2745612c4f3137c6e2e75f688b411fde9953
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to exploit users via phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nyett.hk/uploads/news/files/rolinubilojovosa.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d6a5c93a---39843996114.pdfIn PDF document text
    • http://eichler-kammerer.de/68640689078.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce50cb4fb2---99365587200.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/335ktv3bgumdr3vef0amph69p6/tizokomezuxelubawusidob.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063fbb1cfe---vemedo.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160741359a1258---lepivufixemamukege.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/reduliponadutefakik.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/towonerajemivugit.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/86840704196.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/lofujiduxo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8d62100ae---36805716522.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/64639219160.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e943df90e816b2a976cf53ce47c254bb/rakupuzanopuguduwamew.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/afq99lrbsnj853o74qg6h90116/wezepujopuxifamozam.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/mewizezadud.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/79494990474.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/fe94651e8f56ac28d7ae4cd7ccae237e/79227070917.pdfIn PDF document text
    • http://polish-house.com/uploades/fckeditorfile/ridajiva.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/bivedum.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/db34e6f9189ed5e5e2d261f9d14b4420/gaguxinebopepine.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/52450172274.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/f10d3594621a4cb42bd10a022b2f45b7/14381049641.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/68680937911.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/mopiretawibojesadef.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dcd2ac116---verukogiviget.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/10605663127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=panel+interview+questions+and+answersPDF 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_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 16748 bytes
SHA-256: 5b5133e9a7cf40d67ef974845ee73d690324123ea9d86ebacab31b54718b277b
font_02_sfnt_off00012899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12899 10640 bytes
SHA-256: df1f1520ea60910fac7754ebb43a1933557c574ba02f61d7e5982120282c09ea

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